Details of a Researcher - TANZAWA, Toru

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TANZAWA, Toru

Scopus Paper Info

Paper Count: 96 Citation Count: 2486 h-index: 21

Click to view the Scopus page. The data was downloaded from Scopus API in September 10, 2025, via http://api.elsevier.com and http://www.scopus.com .

Google Scholar Information (Citations per year)

Citation Count: 9376 h-index: 43 i10-index: 179

Click to view the Google Scholar page.

Scopus Information

Affiliation

Faculty of Science and Engineering, Graduate School of Information, Production, and Systems

Job title

Professor

Degree

Ph. D ( 2002.03 University of Tokyo )

Homepage URL

https://tanzawa-lab.w.waseda.jp

Committee Memberships

2025.09

-

Now

IEEE International Reliability Physics Symposium (IRPS) Technical Committee
2017.06

-

2023.05

電子情報通信学会エレクトロニクスソサエティ集積回路研究専門委員会専門委員
2020.11

-

2021.07

電子情報通信学会集積回路設計技術に関する小特集編集委員会
2013.05

-

2019.09

IEEE ESSCIRC Technical program committee

Professional Memberships

　

　

　

IEICE
　

　

　

IEEE

Research Areas

Power engineering Energy harvesting / Electron device and electronic equipment Lowe power design, power converter, memory

Research Interests

Low power analog
Energy harvesting
Greening of integrated circuits
IoT
Power management
Circuit design

▼display all

Awards

Test of Time Award

2023.06 Symposium on VLSI Technology and Circuits

Winner： H. Banba, H. Shiga, A. Umezawa, T. Miyaba, T. Tanzawa, S. Atsumi, K. Sakui
IEEE Fellow

2016.01 IEEE

Papers

Evolution of Reconfigurable Switched-Capacitor dc–dc Converters: Significant contributions to NAND Flash, microprocessor, and energy harvesting

Toru Tanzawa

IEEE Solid-State Circuits Magazine 16 ( 4 ) 83 - 95 2024.11 [Refereed]

Authorship：Lead author, Last author, Corresponding author

DOI
A Low-Power BL Path Design for NAND Flash Based on an Existing NAND Interface

Hikaru Makino, Toru Tanzawa

Journal of Low Power Electronics and Applications 14 ( 1 ) 1 - 16 2024.02 [Refereed]

　View Summary

This paper is an extended version of a previously reported conference paper regarding a low-power design for NAND Flash. As the number of bits per NAND Flash die increases with cost scaling, the IO data path speed increases to minimize the page access time with a scaled CMOS in IOs. The power supply for IO buffers, namely, VDDQ, decreases from 3 V to 1.2 V, accordingly. In this paper, the way in which a reduction in VDDQ can contribute to power reduction in the BL path is discussed and validated. Conventionally, a BL voltage of about 0.5 V has been supplied from a supply voltage source (VDD) of 3 V. The BL path power can be reduced by a factor of VDDQ to VDD when the BL voltage is supplied by VDDQ. To maintain a sense margin at the sense amplifiers, the supply source for BLs is switched from VDDQ to VDD before sensing. As a result, power reduction and an equivalent sense margin can be realized at the same time. The overhead of implementing this operation is an increase in the BL access time of about 2% for switching the power supply from VDDQ to VDD and an increase in the die size of about 0.01% for adding the switching circuit, both of which are not significant in comparison to the significant power reduction in the BL path power of the NAND die of about 60%. The BL path is then designed in 180 nm CMOS to validate the design. When the cost for powering the SSD becomes quite significant, especially for data centers, an additional lower voltage supply, such as 0.8 V, dedicated to BL charging for read and program verifying operations may be the best option for future applications.

DOI

Scopus

2

Citation

(Scopus)
Modeling of Cross-Coupled AC–DC Charge Pump Operating in Subthreshold Region

Ryoma Kotsubo, Toru Tanzawa

Electronics 12 ( 24 ) 5031 - 5031 2023.12 [Refereed]

Authorship：Corresponding author

　View Summary

This paper proposes a circuit model of a cross-coupled CMOS AC–DC charge pump (XC–CP) operating in the subthreshold region. The aim is to improve the efficiency of designing XC–CPs with a variety of specifications, e.g., input and output voltages and AC input frequency. First, it is shown that the output resistance (Ro) of XC–CP is much higher than those of CPs with single diodes (SD–CP) and ultra-low-power diodes (ULPD–CP) as charge transfer switches (CTSs). Second, the reason behind the above feature of XC–CP, identified by a simple model, is that the gate-to-source voltages of CTS MOSFETs are independent of the output voltage of the CP. Third, the high but finite Ro of XC–CP is explainable with a more accurate model that includes the dependence of the saturation current of MOSFETs operating in the subthreshold region on the drain-to-source voltage, which is a function of the output voltage of CP. The model is in good agreement with measured and simulated results of XC–, SD–, and ULPD–CPs fabricated in a 250 nm CMOS.

DOI

Scopus

3

Citation

(Scopus)
Battery-Assisted Battery Charger with Maximum Power Point Tracking for Thermoelectric Generator: Concept and Experimental Proof

S. Tanabe and T. Tanzawa

Electronics ( 19 ) 2023.09 [Refereed]

DOI
A -31.7 dBm Sensitivity 0.011 mm² CMOS On-Chip Rectifier for Microwave Wireless Power Transfer

Toru Tanzawa

Electronics ( 6 ) 2023.03 [Refereed]

DOI
One-Dimensional Maximum Power Point Tracking Design of Switched-Capacitor Charge Pumps for Thermoelectric Energy Harvesting

Toru Tanzawa

Electronics ( 5 ) 2023.03 [Refereed]

DOI
A Charge Loss Aware Advanced Model of Dickson Voltage Multipliers

Andrea Ballo, Alfio Dario Grasso, Gaetano Palumbo, Toru Tanzawa

IEEE Access 10 2022.11 [Refereed]

DOI

Scopus

18

Citation

(Scopus)
A Design of a Thermoelectric Energy Harvester for Minimizing Sensor Module Cost

Koketsu, K., Tanzawa, T.

Electronics (Switzerland) 11 ( 21 ) 2022.10 [Refereed]

DOI

Scopus

5

Citation

(Scopus)
Design Space Exploration of Antenna Impedance and On-Chip Rectifier for Microwave Wireless Power Transfer

Hashimoto, T., Tanzawa, T.

Electronics (Switzerland) 11 ( 19 ) 2022.10 [Refereed]

DOI

Scopus

4

Citation

(Scopus)
More Enhanced Swing Colpitts Oscillators: A Circuit Analysis

Nomura, T., Tanzawa, T.

Electronics (Switzerland) 11 ( 18 ) 2022.09 [Refereed]

DOI

Scopus

1

Citation

(Scopus)
Pre-Emphasis Pulse Design for Reducing Bit-Line Access Time in NAND Flash Memory

Kondo, J., Tanzawa, T.

Electronics (Switzerland) 11 ( 13 ) 1926 2022.06 [Refereed]

DOI

Scopus

2

Citation

(Scopus)
Design of Switched-Capacitor DC-DC Voltage-Down Converters Driven by Highly Resistive Energy Transducer

Demura, Y., Tanzawa, T.

Electronics (Switzerland) 11 ( 12 ) 1874 2022.06 [Refereed]

DOI

Scopus
A 30% Power Reduction Circuit Design for NAND Flash by Utilizing 1.2V I/O Power Supply to Bitline Path

Toru Tanzawa

CONFERENCE PROCEEDINGS OF IEEE ASIA PACIFIC CONFERENCE ON POSTGRADUATE RESEARCH IN MICROELECTRONICS AND ELECTRONICS (PRIMEASIA) 2022

DOI
An optimum structure of scalable capacitors in 3d crosspoint memory technology

Tone, Y., Tanzawa, T.

Electronics (Switzerland) 10 ( 22 ) 2755 2021.11 [Refereed]

DOI

Scopus
Charge Pumps for Ultra-Low-Power Applications: Analysis, Design, and New Solutions

Andrea Ballo, Alfio Dario Grasso, Gaetano Palumbo, Toru Tanzawa

IEEE Transactions on Circuits and Systems II: Express Briefs 68 ( 8 ) 2021.08 [Refereed]

DOI

Scopus

35

Citation

(Scopus)
Pre-emphasis pulse design for random-access memory

Sugiura, Y., Tanzawa, T.

Electronics (Switzerland) 10 ( 12 ) 2021.06 [Refereed]

DOI

Scopus

1

Citation

(Scopus)
A circuit analysis of pre-emphasis pulses for RC delay lines

Matsuyama, K., Tanzawa, T.

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 1 ( 6 ) 912 - 926 2021.06 [Refereed]

DOI

Scopus

2

Citation

(Scopus)
Design of a charge pump circuit and system with input impedance modulation for a flexible-type thermoelectric generator with high-output impedance

Koketsu, K., Tanzawa, T.

Electronics (Switzerland) 10 ( 10 ) 2021.05 [Refereed]

DOI

Scopus

9

Citation

(Scopus)
A fully integrated ac-dc converter in 1 v cmos for electrostatic vibration energy transducer with an open circuit voltage of 10 v

Ishida, Y., Tanzawa, T.

Electronics (Switzerland) 10 ( 10 ) 2021.05 [Refereed]

DOI

Scopus

5

Citation

(Scopus)
An optimum design of clocked AC-DC charge pump circuits for vibration energy harvesting

Ye, J., Tanzawa, T.

Electronics (Switzerland) 9 ( 12 ) 2020.12 [Refereed]

DOI

Scopus

3

Citation

(Scopus)
A fully integrated clocked AC-DC charge pump for magnetostrictive vibration energy harvesting

Kawauchi, H., Tanzawa, T.

Electronics (Switzerland) 9 ( 12 ) 2020.12 [Refereed]

DOI

Scopus

5

Citation

(Scopus)
Linear distribution of capacitance in Dickson charge pumps to reduce rise time

Andrea Ballo, Alfio Dario Grasso, Gaetano Palumbo, Toru Tanzawa

International Journal of Circuit Theory and Applications 48 ( 4 ) 2020.04 [Refereed]

DOI

Scopus

26

Citation

(Scopus)
A Design Window for Device Parameters of Rectifying Diodes in 2.4 GHz Micro-watt RF Energy Harvesting

Toru Tanzawa

Proceedings of the Ieee Asia-pacific Microwave Conference (apmc) 2019
Toward a Minimum-Operating-Voltage Design of DC-DC Charge Pump Circuits for Energy Harvesting

Toru Tanzawa

IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS 2019

DOI

Scopus

9

Citation

(Scopus)
Design of Pre-Emphasis Pulses for Large Memory Arrays with Minimal Word-Line Delay Time

Toru Tanzawa

IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS 2019
On the Output Impedance and an Output Current–Power Efficiency Relationship of Dickson Charge Pump Circuits

Toru Tanzawa

IEEE Transactions on Circuits and Systems II: Express Briefs 65 ( 11 ) 1664 - 1667 2018.11 [Refereed]

DOI

Scopus

21

Citation

(Scopus)
Design considerations on power, performance, reliability and yield in 3D NAND technology

Toru Tanzawa

IEICE Transactions on Electronics E101C ( 1 ) 78 - 81 2018.01 [Refereed]

　View Summary

This paper discusses design challenges and possible solutions for 3D NAND. A 3D NAND array inherently has a larger parasitic capacitance and thereby critical area in terms of product yield. To mitigate such issues associated with 3D NAND technology, array control and divided array architecture for improving reliability and yield and for reducing area overhead, program time, energy per bit and array noise are proposed.

DOI

Scopus

1

Citation

(Scopus)
An Analytical Model of Charge Pump DC-DC Voltage Multiplier Using Diodes

Toru Tanzawa

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES E100A ( 5 ) 1137 - 1144 2017.05 [Refereed]

　View Summary

An output voltage - current equation of charge pump DC-DC voltage multiplier using diodes is provided to cover wide clock frequency and output current ranges for designing energy harvester operating at a near-threshold voltage or in sub-threshold region. Equivalent circuits in slow and fast switching limits are extracted. The effective threshold voltage of the diode in slow switching limit is also derived as a function of electrical characteristics of the diodes, such as the saturation current and voltage slope parameter, and design parameters such as the number of stages, capacitance per stage, parasitic capacitance at the top plate of the main boosting capacitor, and the clock frequency. The model is verified compared with SPICE simulation.

DOI

Scopus

8

Citation

(Scopus)
An Analytical Model of AC-DC Charge Pump Voltage Multipliers

Toru Tanzawa

IEICE TRANSACTIONS ON ELECTRONICS E99C ( 1 ) 108 - 118 2016.01 [Refereed]

　View Summary

This paper proposes an analytical, closed-form AC-DC voltage multiplier model and investigates the dependency of output current and input power on circuit and device parameters. The model uses no fitting parameters and a frequency term applicable to both multipliers using diodes and metal-oxide semiconductor field effect transistors (MOSFETs). Analysis enables circuit designers to estimate circuit parameters, such as the number of stages and capacitance per stages, and device parameters such as saturation current (in the case of diodes) or transconductance (in the case of MOSFETs). Comparisons of the proposed model with SPICE simulation results as well as other models are also provided for validation. In addition, design optimizations and the impact of AC power source impedance on output power are also investigated.

DOI

Scopus

2

Citation

(Scopus)
Basics of charge pump circuit

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
system overview and key design considerations

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
Pump control circuits

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
Charge pump state of the art

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
Design of ac–dc charge pump

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
Design of dc-dc dickson charge pump

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
System design

Tanzawa, T.

Analog Circuits and Signal Processing 2016

DOI

Scopus
Preface

Tanzawa, T.

Analog Circuits and Signal Processing 2016
Evolution of Reconfigurable Switched-Capacitor dc–dc Converters: Significant contributions to NAND Flash, microprocessor, and energy harvesting

Toru Tanzawa

IEEE Solid-State Circuits Magazine 16 ( 4 ) 83 - 95 2015.11 [Refereed]

Authorship：Lead author, Last author, Corresponding author

DOI
An Analytical Model of Multi-Sine AC-DC Voltage Multiplier

Toru Tanzawa

IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS 2015
On-chip High-Voltage Generator Design: Design Methodology for Charge Pumps: Second Edition

Tanzawa, T.

On-chip High-Voltage Generator Design: Design Methodology for Charge Pumps: Second Edition 2015

DOI

Scopus

24

Citation

(Scopus)
A Comprehensive Optimization Methodology for Designing Charge Pump Voltage Multipliers

Toru Tanzawa

2015 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS) 1358 - 1361 2015 [Refereed]

　View Summary

This paper proposes a comprehensive optimization methodology to simultaneously determine the clock frequency, area ratio of pump capacitor to switching circuit, number of stages, and capacitor size of integrated switched-capacitor charge pump voltage multipliers. Power efficiency of the charge pump is also discussed in various views. How the top and bottom plate parasitic capacitance and the threshold voltage of the switching circuit affect power efficiency is reviewed. The optimization methodology is demonstrated. Comparisons of the model with SPICE simulation results are also provided for validation.
An Optimum Design for Integrated Switched-Capacitor Dickson Charge Pump Multipliers With Area Power Balance

Toru Tanzawa

IEEE TRANSACTIONS ON POWER ELECTRONICS 29 ( 2 ) 534 - 538 2014.02 [Refereed]

　View Summary

This letter expands upon an optimum design of integrated switched-capacitor Dickson charge pump multipliers for minimizing the power, which considers the parasitic capacitance of both the top and bottom plates of pump capacitors. This letter also discusses an optimum design with area power balance, and suggests that the number of stages should be epsilon N-MIN, where e is 1.5-1.7 and N-MIN is the minimum number of stages required to meet the condition that the output current is zero at a given output voltage.

DOI

Scopus

36

Citation

(Scopus)
An Analytical Model of AC-DC Voltage Multipliers

Toru Tanzawa

2014 21ST IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS) 323 - 326 2014 [Refereed]

　View Summary

This paper proposes an analytical, closed-form AC-DC voltage multiplier model and investigates the dependency of output current and input power on circuit and device parameters. The model uses no fitting parameters and a frequency term applicable to both multipliers using diodes and metal-oxide semiconductor field effect transistors (MOSFETs). Analysis enables circuit designers to estimate circuit parameters, such as the number of stages and capacitance per stages, and device parameters such as saturation current (in the case of diodes) or transconductance (in the case of MOSFETs). Comparisons of the proposed model with SPICE simulation results as well as other models are also provided for validation.
Design of DC-DC Switched-Capacitor Voltage Multiplier driven by DC Energy Transducer

Toru Tanzawa

2014 21ST IEEE INTERNATIONAL CONFERENCE ON ELECTRONICS, CIRCUITS AND SYSTEMS (ICECS) 327 - 330 2014 [Refereed]

　View Summary

This paper proposes a model to help designers maximize output power in systems that contain a DC energy transducer and a DC-DC multiplier charge pump by identifying initial circuit and device parameter estimates for SPICE simulations. This model also enables designers to use simple equations to estimate the sensitivity of the DC transducer's characteristic parameters, like short circuit current and output impedance, on the charge pump's output power.
On-chip High-Voltage Generator Design

Tanzawa, T.

On-chip High-Voltage Generator Design 2013

DOI

Scopus

9

Citation

(Scopus)
A Behavior Model of an On-Chip High Voltage Generator for Fast, System-Level Simulation

Toru Tanzawa

IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS 20 ( 12 ) 2351 - 2355 2012.12 [Refereed]

　View Summary

This brief discusses modeling of a high-voltage generator, including a charge pump circuit and a regulator for accelerating system-level simulations. Event-driven simulators become slow when hard switching frequently occurs to enable charge pump circuits even with a conventional model. A current mirror is added to the pump model and is connected to an output node of a comparator in the voltage detector to make every node in the feedback loop fully analog. Simulation results show that the simulation time for voltage generators' system is reduced by a factor of about 10 with an error of 5% in comparison with the conventional model.

DOI

Scopus

12

Citation

(Scopus)
A Switch-Resistance-Aware Dickson Charge Pump Model for Optimizing Clock Frequency

Toru Tanzawa

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 58 ( 6 ) 336 - 340 2011.06 [Refereed]

　View Summary

This brief proposes an explicit Dickson charge pump model, including the effect of the resistance of switching devices on the pump performance. Using this model, one can estimate an optimum clock frequency and the size of the transferring transistors in terms of the main pump capacitors, the auxiliary capacitors, and the transfer transistors to maximize the output current under the same silicon area in a given technology.

DOI

Scopus

41

Citation

(Scopus)
A Program Disturb Model and Channel Leakage Current Study for Sub-20 nm NAND Flash Cells

Alessandro Torsi, Yijie Zhao, Haitao Liu, Toru Tanzawa, Akira Goda, Pranav Kalavade, Krishna Parat

IEEE TRANSACTIONS ON ELECTRON DEVICES 58 ( 1 ) 11 - 16 2011.01 [Refereed]

　View Summary

We have developed a program-disturb model to characterize the channel potential of the program-inhibited string during NAND flash cell programming. This model includes cell-to-cell capacitances from 3-D technology computer-aided design simulation and leakage currents associated with the boosted channel. We studied the program-disturb characteristics of sub-30-nm NAND cells using a delayed programming pulse method. The simulation results agree with the experimental data very well and show quantitative impacts of junction leakage current, band-to-band tunneling (BTBT) current, Fowler-Nordheim tunneling current, and channel capacitance on the program disturb. We further discuss the cell-scaling trend and identify that the BTBT current can be a dominant mechanism for the program disturb of sub-20-nm NAND cells.

DOI

Scopus

45

Citation

(Scopus)
On Two-Phase Switched-Capacitor Multipliers With Minimum Circuit Area

Toru Tanzawa

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS 57 ( 10 ) 2602 - 2608 2010.10 [Refereed]

　View Summary

This paper compares the performance among two-phase switched-capacitor multipliers to identify the optimum topology with the smallest circuit area. The optimum number of stages is calculated for every multiplier to minimize the circuit area under the condition that a certain current is outputted with a given output voltage. Then, the circuit areas of the serial-parallel, linear (LIN), Fibonacci, and 2(N) multipliers are compared. Results show that the LIN cell is the best for integration because of the smallest total capacitor area and the highest current efficiency under the assumption that the parasitic capacitance is not smaller than 10% of the multiplier capacitance, and the Fibonacci cell is the best for discrete application because of the minimum number of capacitor components with moderate current efficiency under the assumption that the parasitic capacitance is not larger than 1% of the multiplier capacitance.

DOI

Scopus

49

Citation

(Scopus)
A Behavior Model of a Dickson Charge Pump Circuit for Designing a Multiple Charge Pump System Distributed in LSIs

Toru Tanzawa

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 57 ( 7 ) 527 - 530 2010.07 [Refereed]

　View Summary

This brief discusses how each of multiple charge pump circuits in LSIs is designed in case where the power and ground line resistance is not negligible. A behavior model for a charge pump, including the local power and ground voltages as input parameters, is proposed and a systematic design methodology is then presented. A system designer can use the behavior model to determine the specifications on each pump and power and ground resistance for minimizing overall area.

DOI

Scopus

13

Citation

(Scopus)
Dickson Charge Pump Circuit Design with Parasitic Resistance in Power Lines

Toru Tanzawa

IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS 2009

DOI

Scopus

15

Citation

(Scopus)
A process- and temperature-tolerant power-on reset circuit with a flexible detection level higher than the bandgap voltage

Toru Tanzawa

IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS), VOLS 1-6, CONFERENCE PROCEEDINGS 2008
A 2.4-GHz temperature-compensated CMOS LC-VCO for low frequency drift low-power direct-modulation GFSK transmitters

T Tanzawa, K Agawa, H Shibayama, R Terauchi, K Hisano, H Ishikuro, S Kousai, H Kobayashi, H Majima, T Takayama, M Koizumi, F Hatori

IEICE TRANSACTIONS ON ELECTRONICS E88C ( 4 ) 490 - 495 2005.04 [Refereed]

　View Summary

A frequency drift of open-loop PLL is an issue for the direct-modulation applications such as Bluetooth transceiver. The drift mainly comes from a temperature variation of VCO during the transmission operation. In this paper, we propose the optimum location of the VCO, considering the temperature gradient through the whole-chip thermal analysis. Moreover, a novel temperature-compensated VCO, employing a new biasing scheme, is proposed. The combination of these two techniques enables the power reduction of the transmitter by 33% without sacrificing the performance.

DOI

Scopus

2

Citation

(Scopus)
A low-IF CMOS single-chip Bluetooth EDR transmitter with digital I/Q mismatch trimming circuit

Toru Tanzawa

SYMPOSIUM ON VLSI CIRCUITS, DIGEST OF TECHNICAL PAPERS 2005

DOI

Scopus

8

Citation

(Scopus)
A 44-mm(2) four-bank eight-word page-read 64-Mb flash memory with flexible block redundancy and fast accurate word-line voltage controller

T Tanzawa, A Umezawa, T Taura, H Shiga, T Hara, Y Takano, T Miyaba, N Tokiwa, K Watanabe, H Watanabe, K Masuda, K Naruke, H Kato, S Atsumi

IEEE JOURNAL OF SOLID-STATE CIRCUITS 37 ( 11 ) 1485 - 1492 2002.11 [Refereed]

　View Summary

The highest bit-density 64-Mb NOR flash memory with dual-operation function of 44 mm(2) was developed by introducing negative-gate channel-erase NOR flash memory cell technology, 0.16-mum CMOS flash memory process technology, and four-bank hierarchical word-line and bit-line architecture. The chip has flexible block redundancy for high yield, a fast accurate word-line voltage controller for a fast erasing time of 0.5 s, and an eight-word page-read access capability for high read performance of an effective access time of 30 ns at a wide supply voltage range of 2.3-3.6 V.

DOI

Scopus

3

Citation

(Scopus)
High-voltage transistor scaling circuit techniques for high-density negative-gate, channel-erasing NOR flash memories

T Tanzawa, Y Takano, K Watanabe, S Atsumi

IEEE JOURNAL OF SOLID-STATE CIRCUITS 37 ( 10 ) 1318 - 1325 2002.10 [Refereed]

　View Summary

In order to scale high-voltage transistors for high-density negative-gate channel-erasing NOR flash memories, two circuit techniques were developed. A proposed level shifter with low operating voltage is composed of three parts, a latch holding the negative erasing voltage, two coupling capacitors connected with the latched nodes in the latch, and high-voltage drivers inverting the latch, resulting in reduction of the maximum internal voltage by 0.5 V. A proposed high-voltage generator adds a path-gate logic to a conventional high-voltage generator to realize both low noise and low ripple voltage, resulting in a reduction of the maximum internal voltage by 0.5 V. As a result, these circuit techniques along with high coupling-ratio cell technology can scale down the high-voltage transistors by 15% and can realize higher density negative-gate channel-erase NOR flash memories in comparison with the source-erase NOR flash memories.

DOI

Scopus

34

Citation

(Scopus)
Circuit techniques for a 1.8-V-only NAND flash memory

T Tanzawa, T Tanaka, K Takeuchi, H Nakamura

IEEE JOURNAL OF SOLID-STATE CIRCUITS 37 ( 1 ) 84 - 89 2002.01 [Refereed]

　View Summary

Focusing on internal high-voltage (V-pp) switching and generation for low-voltage NAND flash memories, this paper describes a V-pp switch, row decoder, and charge-pump circuit. The proposed nMOS V-pp switch is composed of only intrinsic high-voltage transistors without channel implantation, which realizes both reduction of the minimum operating voltage and elimination of the V-pp leakage current. The proposed row decoder scheme is described in which all blocks are in selected state in standby so as to prevent standby current from flowing through the proposed V-pp switches in the row decoder. A merged charge-pump scheme generates a plurality of voltage levels with an individually optimized efficiency, which reduces circuit area in comparison with the conventional scheme that requires a separate charge-pump circuit for each voltage level. The proposed circuits were implemented on an experimental NAND flash memory. The charge pump and V-pp switch successfully operated at a supply voltage of 1.8 V with a standby current of 10 muA. The proposed pump scheme reduced the area required for charge-pump circuits by 40%.
Wordline voltage generating system for low-power low-voltage flash memories

T Tanzawa, A Umezawa, M Kuriyama, T Taura, H Banba, T Miyaba, H Shiga, Y Takano, S Atsumi

IEEE JOURNAL OF SOLID-STATE CIRCUITS 36 ( 1 ) 55 - 63 2001.01 [Refereed]

　View Summary

A low-power wordline voltage generating system is developed for low-voltage flash memories, The limit for the stand-by current including the operation current for the band-gap reference and the stand-by wordline voltage generator is discussed. The system was implemented on a 1.8-V 32-Mb flash memory Fabricated with a 0.25-mum flash memory process and achieved with very low stand-by current of 2 muA typically, and high operating frequency of 25 MHz in read operation at 1.8 V, A low-voltage level shifter with high-speed switching is also proposed.
A channel-erasing 1.8-V-only 32-Mb NOR flash EEPROM with a bitline direct sensing scheme

S Atsumi, A Umezawa, T Tanzawa, T Taura, H Shiga, Y Takano, T Miyaba, M Matsui, H Watanabe, K Isobe, S Kitamura, S Yamada, M Saito, S Mori, T Watanabe

IEEE JOURNAL OF SOLID-STATE CIRCUITS 35 ( 11 ) 1648 - 1654 2000.11 [Refereed]

　View Summary

A 1.8-V-only 32-Mb NOR flash EEPROM has been developed based on the 0.25-mum triple-well double-metal CMOS process. A channel-erasing scheme has been implemented to realize a cell size of 0.49 mum(2), the smallest yet reported for 0.25-mum CMOS technology. A block decoder circuit with a novel erase-reset sequence has been designed for the channel-erasing operation. A bitline direct sensing scheme and a wordline boosted voltage pooling method have been developed to obtain high-speed reading operation at low voltage. Access time of 90 ns at 1.8 V has been realized.
Design of a sense circuit for low-voltage flash memories

T Tanzawa, Y Takano, T Taura, S Atsumi

IEEE JOURNAL OF SOLID-STATE CIRCUITS 35 ( 10 ) 1415 - 1421 2000.10 [Refereed]

　View Summary

A new sense circuit directly sensing the bitline voltage is proposed for low-voltage flash memories. A simple reference voltage generation method and a dataline switching method with matching of the stray capacitance between the dataline pairs are also proposed. A design method for the bitline clamp load transistors is described, taking bitline charging speed and process margins into account. The sense circuit was implemented in a 32-Mb flash memory fabricated with a 0.25-mu m flash memory process and successfully operated at a low voltage of 1.5 V.
Optimization of word-line booster circuits for low-voltage flash memories

T Tanzawa, S Atsumi

IEEE JOURNAL OF SOLID-STATE CIRCUITS 34 ( 8 ) 1091 - 1098 1999.08 [Refereed]

　View Summary

Two word-line booster circuits, which output a word-line voltage for reading dash memory data, are analyzed and optimized. A capacitor-switched booster circuit outputs a voltage higher than the supply voltage by switching the connection state of one or more boosting capacitors with the load capacitor from parallel to series. The optimum number of capacitors and Capacitance per boosting capacitor are obtained as a function of the voltage ratio of the required high voltage to the supply voltage. The operation current consumed by the boosting operation is also analytically derived. In addition, another booster circuit-Dickson charge-pump circuit-is optimized under the condition to maximize the output current at a high word-line voltage. Characteristics of the booster circuits are compared, and the selection of booster circuit for low-voltage flash memory is discussed.
A CMOS bandgap reference circuit with sub-1-V operation

H Banba, H Shiga, A Umezawa, T Miyaba, T Tanzawa, S Atsumi, K Sakui

IEEE JOURNAL OF SOLID-STATE CIRCUITS 34 ( 5 ) 670 - 674 1999.05 [Refereed]

　View Summary

This paper proposes a CMOS bandgap reference (BGR) circuit, which can successfully operate with sub-1-V supply, Zn the conventional BGR circuit, the output voltage V-ref is the sum of the built-in voltage of the diode V-f and the thermal voltage V-T Of kT/q multiplied by a constant. Therefore, V-ref is about 1.25 V, which limits a low supply-voltage operation below 1 V, Conversely, in the proposed BGR circuit, V-ref has been converted From the sum of two currents; one is proportional to V-f and the other is proportional to V-T. An experimental BGR circuit, which is simply composed of a CMOS op-amp, diodes, and resistors, has been fabricated in a conventional 0.4-mu m flash memory process. Measured V-ref is 518 +/- 15 mV (3 sigma) for 23 samples on the same wafer at 27-125 degrees C.
A multipage cell architecture for high-speed programming multilevel NAND flash memories

K Takeuchi, T Tanaka, T Tanzawa

IEEE JOURNAL OF SOLID-STATE CIRCUITS 33 ( 8 ) 1228 - 1238 1998.08 [Refereed]

　View Summary

To realize low-cost, highly reliable, high-speed programming, and high-density multilevel flash memories, a multipage cell architecture has been proposed. This architecture enables both precise control of the V-th Of a memory cell and fast programming without any area penalty. In the case of a four-level cell, a high programming speed of 236 mu s/512 bytes or 2.2 Mbytes/s can be obtained, which is 2.3 times faster than the conventional method. A small die size can be achieved with the newly developed compact four-level column latch circuit, A preferential page select method has also been proposed so as to improve the data retention characteristics. The IC error rate can be decreased by as much as 43%, and a highly reliable operation can be realized.
A dynamic analysis of the Dickson charge pump circuit

T Tanzawa, T Tanaka

IEEE JOURNAL OF SOLID-STATE CIRCUITS 32 ( 8 ) 1231 - 1240 1997.08 [Refereed]

　View Summary

Dynamics of the Dickson charge pump circuit have been analyzed. The analytical results enable the estimation of the rise time of the output voltage and that of the power consumption during boosting. By using this analysis, the optimum number of stages to minimize the rise time has been estimated as 1.4 N-min, where N-min is the minimum value of the number of stages necessary for a given parameter set of a supply voltage, threshold voltages of transfer diodes, and a boosted voltage. Moreover, the self-load capacitance of the charge pump, which should be charged up at the same time as the output load capacitance of the charge pump, has been estimated as about one-third of the total charge pump capacitance. As a result, the equivalent circuit of the charge pump has been modified. The analytical results have been in good agreement with the simulation results by the iteration method, typically within 10% for the rise time and within 2% for the power consumption. In case of a charge pump with MOS transfer transistors, the analytical result of the rise time has agreed with the SPICE simulation within 10%.
A stable programming pulse generator for single power supply flash memories

T Tanzawa, T Tanaka

IEEE JOURNAL OF SOLID-STATE CIRCUITS 32 ( 6 ) 845 - 851 1997.06 [Refereed]

　View Summary

A stable programming pulse generator has been developed for single power supply, high-speed programming, and low-power Flash memories, The newly developed delay circuit operates by amplifying the difference between the reference voltage and the capacitor voltage raised by the charging current which is proportional to the reference voltage, Linearity between the capacitor voltage swing and the driving current enables us to make the delay circuit supply voltage-, temperature-, and process-tolerant, Thus, the proposed delay circuit stably controls a programming pulse width through all operational ranges of supply voltage and temperature, The output frequency of the newly developed oscillator is inversely proportional to the supply voltage, This oscillator stably drives charge pump circuits which generate high programming voltages on chip since dependence of charge pump characteristics on frequency and supply voltage can be canceled, As a result, the programming pulse generator including the delay circuit and the oscillator has reduced the total programming time under the slowest condition, i.e., high temperature and low voltage condition, by 30% and the power consumption under,the fastest condition, i.e., low temperature and high voltage condition, by 20%, for a 3.3 V-only Flash memory.
A compact on-chip ECC for low cost flash memories

T Tanzawa, T Tanaka, K Takeuchi, R Shirota, S Aritome, H Watanabe, G Kemink, K Shimizu, S Sato, Y Takeucki, K Ohuchi

IEEE JOURNAL OF SOLID-STATE CIRCUITS 32 ( 5 ) 662 - 669 1997.05 [Refereed]

　View Summary

A compact on-chip error correcting circuit (ECC) for low cost Flash memories has been developed,The total increase in chip area is 2%, including all cells, sense amplifiers, logic, and wiring associated with the ECC, The proposed on-chip ECC, employing 10 check bits for 512 data bits, has been implemented on an experimental 64M-bit NAND Flash memory, The cumulative sector error rate has been improved from 10(-1) to 10(-10). By transferring read data from the sense amplifiers to the ECC twice, 522-Byte temporary buffers, which are required for the conventional ECC and occupy a large part of the ECC area, have been eliminated, As a result, the area for the circuit has been drastically reduced by a factor of 25, The proposed on-chip ECC has been optimized in consideration of balance between the reliability improvement and the cell area overhead, The power increase has been suppressed to less than 1 mA.
QUANTUM-MECHANICS OF A PARTICLE CONFINED TO A TWISTED RING

S TAKAGI, T TANZAWA

PROGRESS OF THEORETICAL PHYSICS 87 ( 3 ) 561 - 568 1992.03 [Refereed]

　View Summary

We derive an effective Hamiltonian for a particle confined to a thin tube which is gently twisted and curved to form a closed loop. The Hamiltonian describes the effect of both the curvature and the torsion of the loop correctly to the second order. Applied to the case of a tube of circular cross section, it reveals complete analogy with the Aharonov-Bohm effect. We also discuss eigenmodes for Mobius-like rings formed by a tube of non-circular cross section.
QUANTUM-MECHANICS OF A PARTICLE ON A CURVED SURFACE - COMPARISON OF 3 DIFFERENT APPROACHES

Toru Tanzawa

Progress of Theoretical Physics 88 ( 2 ) 229 - 249 1992.02 [Refereed]

DOI

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Books and Other Publications

Fully-Integrated Power Management Circuits for Thermoelectric Energy Harvesting

Toru Tanzawa( Part： Sole author)

Springer Nature 2024.06 ISBN: 9783031597886
On-chip High-Voltage Generator Design: Design Methodology for Charge Pumps, 2nd edition

T. Tanzawa( Part： Sole author)

Springer 2015.10
Power Aware Design Methodologies

T. Tanzawa( Part： Joint author)

Kluwer Academic Publishers 2002.01

Presentations

Design of a Low-Voltage DC-DC Boost Converter Using an Enhanced Swing Colpitts Oscillator for Energy Harvesting

Taisei Inaba, Tatsuya Nomura, Yohei Kotoya, Toru Tanzawa

23rd IEEE International NEWCAS Conference

Presentation date： 2025.06
Design of a Battery Charger Boost Converter for Extremely Low Supply Voltages Below 10 mV in Energy Harvesting: A Return-on-Investment Approach

Wataru Saito, Toru Tanzawa

23rd IEEE International NEWCAS Conference

Presentation date： 2025.06
Design of Switched-Capacitor AC-DC Voltage Down-Converters for Micro-Watt Electrostatic Vibration Energy Harvesting

Naoto Miyazaki, Toru Tanzawa

23rd IEEE International NEWCAS Conference

Presentation date： 2025.06
Design for Manufacturability and Scalability of NAND Flash

Toru Tanzawa [Invited]

IEEE EDS Distinguished Lecture Talk IEEE EDS Taipei Chapter

Presentation date： 2025.04
Address-Dependent Divided-Bit-Line NAND Flash Memory for Reduction in Latency and Energy

Yuta Sugisawa, Toru Tanzawa

VLSI TSA

Presentation date： 2025.04
Evolution of integrated switched-capacitor converters (Keynote)

Toru Tanzawa [Invited]

39th Conference on Design of Circuits and Integrated Systems (DCIS 2024)

Presentation date： 2024.11
Design of Switched-Capacitor AC-DC Voltage Down Converters Driven by Highly Resistive Energy Transducers

Naoto Miyazaki, Toru Tanzawa

39th Conference on Design of Circuits and Integrated Systems (DCIS 2024)

Presentation date： 2024.11
Circuit design of power converters for long operating life IoT edge devices

Toru Tanzawa [Invited]

IEICE Society Conference

Presentation date： 2024.09
A Design of Battery Charger Boost Converters Operating at Input Voltages Below 10 mV for Energy Harvesting

Wataru Saito, Toru Tanzawa

TJCAS2024

Presentation date： 2024.08
NAND Flash Design for 30% Power Reduction

Toru Tanzawa

FMS (Previously "Flash Memory Summit", Currently "Future of Memory and Storage")

Presentation date： 2024.08
電圧振幅拡大型コルピッツ・オシレータを用いた昇圧回路の設計と動作実証

稲葉泰誠, 丹沢徹

LSIとシステムワークショップ 2024

Presentation date： 2024.05
低電圧電源バッテリ充電器のスイッチング・レギュレータ設計

齋藤航, 丹沢徹

LSIとシステムワークショップ 2024

Presentation date： 2024.05
熱電素子バッテリ直列接続型バッテリ充電回路の充電効率最大化

山本究太郎, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
論理回路電源電圧下限の解析

平野敬祐, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
100mV以下の電源から1.5Vバッテリを充電するチャージポンプの設計

樋口愛莉, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
NANDフラッシュの高速化と低電力化を同時に実現する動的ビット線分割方式

杉澤有右太, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
バッテリ充電器用バッテリ電圧監視回路の回路面積最小化設計

佐藤光翼, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
高インピーダンス発電素子用Switched capacitor降圧コンバータの性能比較: 直並切替型対Dickson型

宮崎直人, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
電圧振幅拡大型コルピッツオシレータを用いたDC-DC昇圧回路の動作実証

稲葉泰誠, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
熱電素子バッテリ直列接続型バッテリ充電回路のMPPT回路設計

田辺駿介, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
差動型LC発振器駆動チャージポンプの昇圧特性評価

植村寛太, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2024.03
Fully-Integrated Power Management Circuits for Thermoelectric Energy Harvesting: Fundamentals and Challenges

Toru Tanzawa [Invited]

Tutorial at the IEEE 30th International Conference on Electronics, Circuits and Systems (ICECS)

Presentation date： 2023.12
高い電力変換効率と低コスト化を目指したエナジーハーベスト用電源回路

丹沢徹 [Invited]

電子情報技術産業協会にてスマートセンシングとその社会実装技術分科会

Presentation date： 2023.11
クロスカップルRF-DCチャージポンプ出力電圧電流特性の非線形性について

小坪稜麻, 丹沢徹

電子情報通信学会ソサイエティ大会

Presentation date： 2023.09
熱電発電用バッテリ充電器のMPPT回路システム設計

田辺駿介, 丹沢徹

電子情報通信学会ソサイエティ大会

Presentation date： 2023.09
IoT端末環境発電でバッテリー交換の手間を省きます！

丹沢徹

イノベーション・ジャパン2023

Presentation date： 2023.08
A Hybrid Thermoelectric Generator – Battery Power Supply System Toward Replacement-Free Battery

S. Tanabe, Y. Sakamoto, H. Uchida, T. Tanzawa

International Conference on Power Electronics - ECCE Asia

Presentation date： 2023.05
静電振動発電用降圧コンバータの設計

宮崎直人, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2023.05
極低電圧電源動作バッテリ充電器の設計

齋藤航, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2023.05
振幅拡大型コルピッツ・オシレータとそれを利用したオンチップ昇圧回路の設計

稲葉泰誠, 野村達也, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2023.05
LC発振器駆動チャージポンプの設計

植村寛太, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2023.05
LC発振器駆動チャージポンプの出力パワー最大化設計

植村寛太, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
熱電発電用チャージポンプ電源回路の出力電力密度最大化設計

濃野公一, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
環境発電素子でバッテリを充電するチャージポンプの設計

山野智輝, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
エネルギー・ハーベスト用小型二次電池のトリクル充放電動作の有効性評価

角果音, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
極低電圧電源でバッテリを充電する昇圧コンバータの設計

齋藤航, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
高入力感度マイクロ波無線電力伝送用CMOSオンチップ整流回路の設計

橋本拓磨, 猫塚光, 戸枝佳駿, 大谷昌幸, 福岡泰彦, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
二電源NANDフラッシュの低電力化回路方式の設計評価

牧野耀, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
電圧振幅拡大型コルピッツオシレータのゲート接地利得モデル

稲葉泰誠, 野村達也, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
静電振動発電用 Switched-Capacitor AC-DC変換回路の設計

宮崎直人, 丹沢徹

電子情報通信学会総合大会

Presentation date： 2023.03
NANDフラッシュ用ブースト・コンバータの高速昇圧動作設計

金山湧司, 丹沢徹

電子情報通信学会/電子通信エネルギー技術研究会

Presentation date： 2023.01
無線電力伝送用ラッチ型RF-DCチャージポンプの回路モデル

小坪稜麻, 丹沢徹

電子情報通信学会/電子通信エネルギー技術研究会

Presentation date： 2023.01
バッテリーと熱電発電素子からなるハイブリッド電源用DC-DCコンバータ設計

田辺駿介, 丹沢徹

電子情報通信学会/電子通信エネルギー技術研究会

Presentation date： 2023.01
IoTセンサー端末のバッテリ交換を不要とする電源回路技術

丹沢徹

JST新技術説明会

Presentation date： 2022.11
CMOSクロスカップル型RF-DCチャージポンプの回路モデル

小坪稜麻, 丹沢徹

Young CAS Researchers Workshop

Presentation date： 2022.11
NANDフラッシュ用ブースト・コンバータの高速昇圧動作方式

金山湧司, 丹沢徹

Young CAS Researchers Workshop

Presentation date： 2022.11
IoT端末のバッテリ交換を不要とするハイブリッド電源回路

田辺駿介, 酒本陽介, 丹沢徹

Young CAS Researchers Workshop

Presentation date： 2022.11
A 30% Power Reduction Circuit Design for NAND Flash by Utilizing 1.2V I/O Power Supply to Bitline Path

H. Makino, T. Tanzawa

Asia Pacific Conference on Postgraduate Research in Microelectronics & Electronics (PrimeAsia) in 2022 IEEE the 18th Asia Pacific Conference on Circuits and Systems

Presentation date： 2022.11
バッテリー交換不要の熱電発電用電源回路

丹沢徹

イノベーション・ジャパン2022

Presentation date： 2022.10
高速充電ブースト・コンバータ昇圧特性の寄生抵抗ばらつき依存性

金山湧司, 丹沢徹

2022年電子情報通信学会ソサイエティ大会

Presentation date： 2022.09
アンテナとオンチップ整流器から成るレクテナの入力電力最小化設計フローの提案

橋本拓磨, 丹沢徹

2022年電子情報通信学会ソサイエティ大会

Presentation date： 2022.09
サブスレッショルド動作CMOS Latch型RF-DC昇圧回路の出力抵抗の起源

小坪稜麻, 丹沢徹

2022年電子情報通信学会ソサイエティ大会

Presentation date： 2022.09
熱電素子・バッテリーのハイブリッド電源用DC/DCコンバータのコンセプト実証

田辺駿介, 酒本陽介, 丹沢徹

2022年電子情報通信学会ソサイエティ大会

Presentation date： 2022.09
オンチップ電源回路の研究開発

丹沢徹 [Invited]

2022年第8回IEEE東京支部講演会

Presentation date： 2022.08
Antenna/On-Chip-Rectifier Co-Design Methodology for Micro-Watt Microwave Wireless Power Transfer

T. Hashimoto, T. Tanzawa

65th IEEE International Midwest Symposium on Circuits and Systems（MWSCAS 2022）

Presentation date： 2022.08
マイクロ波無線電力伝送レクテナの入力パワー最小化設計

橋本拓磨, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2022.05
NANDフラッシュ用ブースト・コンバータの最速昇圧方式の提案

金山湧司, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2022.05
CMOSラッチ型チャージポンプの出力抵抗モデル

小坪稜麻, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2022.05
熱電素子・バッテリーのハイブリッド電源用DC/DC コンバータの設計

田辺駿介, 酒本陽介, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2022.05
環境温度が変動時しても常に出力電力を最大にする熱電発電用チャージポンプ回路システムの設計

濃野公一, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2022.05
NANDフラッシュの読み出し動作に伴うビット線パスの電力を60%削減する回路設計

牧野耀, 丹沢徹

LSIとシステムのワークショップ

Presentation date： 2022.05
インターフェースの変更なしにアレイアクセスの消費電力を30%低減するNANDフラッシュ用センス回路設計

牧野耀, 丹沢徹

電子情報通信学会・集積回路研究会

Presentation date： 2022.04
ブースト・コンバータの昇圧高速化限界の追求

金山湧司, 丹沢徹

2022年電子情報通信学会総合大会

Presentation date： 2022.03
自励発振器を利用した昇圧回路のレギュレータ設計

琴屋陽平, 野村達也, 丹沢徹

2022年電子情報通信学会総合大会

Presentation date： 2022.03
スイッチト・キャパシタ・コンバータ特性の電源インピーダンスの影響：静電発電用電力変換回路の最適設計に向けて

出村洋介, 丹沢徹

2022年電子情報通信学会総合大会

Presentation date： 2022.03
熱電発電のバッテリー充電機能を内蔵したDC/DCコンバータのモデリング

田辺駿介, 酒本陽介, 丹沢徹

2022年電子情報通信学会総合大会

Presentation date： 2022.03
サブスレッショルド動作CMOS Latch型RF-DC昇圧回路のモデリング

小坪稜麻, 丹沢徹

2022年電子情報通信学会総合大会

Presentation date： 2022.03
プリエンファシス・パルスによるNANDフラッシュ・ビット線アクセス高速化

近藤淳之介, 丹沢徹

2022年電子情報通信学会総合大会

Presentation date： 2022.03
1.2V I/O電源を利用したNANDフラッシュの低電力化回路設計

牧野耀, 丹沢徹

2021年電子情報通信学会ソサイエティ大会

Presentation date： 2021.09
回路面積最小でMPPTを実現する熱電発電用チャージポンプ電源回路システムの設計

濃野公一, 丹沢徹

2021年電子情報通信学会ソサイエティ大会

Presentation date： 2021.09
マイクロワットレベルのマイクロ波無線電力伝送受信アンテナとオンチップ整流器の最適設計

橋本拓磨, 丹沢徹

2021年電子情報通信学会ソサイエティ大会

Presentation date： 2021.09
熱電素子を用いてバッテリー寿命を延ばすバッテリー・熱電素子直列接続型DC/DCコンバーターの設計

酒本陽介, 丹沢徹

2021年電子情報通信学会ソサイエティ大会

Presentation date： 2021.09
開放交流電圧が10V を超える静電発電素子から1V トランジスタだけで直流1V に変換するインターフェース回路の設計

石田遥祐, 丹沢徹

電子情報通信学会集積回路研究会

Presentation date： 2021.08
マイクロワット発電素子でも昇圧可能なIoT向け電源回路

丹沢徹

イノベーション・ジャパン2021

Presentation date： 2021.08
大メモリアレイのWL遅延を最小化するプリエンファシスパルス：回路理論と最適パルス発生回路の提案

丹沢徹, 松山和樹 [Invited]

電子情報通信学会集積回路研究会

Presentation date： 2021.04
A Design of Adaptive Charge Pumps with Minimum Circuit Area for Thermoelectric Energy Harvesting under Temperature Variations

K. Nono, T. Tanzawa

IEICE general conference

Presentation date： 2021.03
A Design Guideline of Scalable Capacitors in 3D Cross-Point Memory

Y. Tone, T. Tanzawa

IEICE general conference

Presentation date： 2021.03
A Study of Sensing Schemes for NAND Flash: Shielded Bit-Line vs. All Bit-Line

H. Makino, T. Tanzawa

IEICE general conference

Presentation date： 2021.03
A Study on the Fundamental Limit of Integrated Rectifiers for Low Cost Microwave Wireless Power Transfer

T. Hashimoto, T. Tanzawa

IEICE general conference

Presentation date： 2021.03
A Design of Cold Start Charge Pump for Flexible Thermoelectric Generator with High Output Impedance

Kazuma Koketsu, Toru Tanzawa

IEEE International Conference on Electronics Circuits and Systems

Presentation date： 2020.11
Rectenna with Serially Connected Diodes for Micro-watt Energy Harvesting

Yuki Tabuchi, Toru Tanzawa

IEEE Wireless Power Transfer Conference

Presentation date： 2020.11
IoTエッジ端末の小型化低コスト化振動発電用電源回路

丹沢徹

イノベーション・ジャパン2020

Presentation date： 2020.09
バッテリー・熱電素子直列接続型電力変換回路システムのバッテリー長寿命化コンセプトの実証

Y. Sakamoto, T. Tanzawa

IEICE society conference, C-12-9

Presentation date： 2020.09
静電振動発電用耐プロセス温度変動完全集積化シャント・レギュレータの設計

Y. Ishida, T. Tanzawa

IEICE society conference, C-12-8

Presentation date： 2020.09
マイクロワット・レクテナ最適回路トポロジーの出力電圧電流平面へのマッピング

Y. Tabuchi, T. Tanzawa

IEICE society conference, C-2-11

Presentation date： 2020.09
高出力インピーダンス発電素子用変換回路の入力インピーダンス時分割変調制御方式の提案

纐纈一真, 丹沢徹

電子情報通信学会集積回路研究会

Presentation date： 2020.08
An Optimum Circuit Design of clocked AC-DC charge pumps

J. Ye, T. Tanzawa

IEICE general conference

Presentation date： 2020.03
A Double Resonant Enhanced Swing Colpitts Oscillator for Extremely Low-Voltage DC/DC Boost Conversion

T. Nomura, T. Tanzawa

IEICE general conference

Presentation date： 2020.03
An Optimum Pre-Emphasis Pulse Design for Random Access Memory

Y. Sugiura, T. Tanzawa

IEICE general conference

Presentation date： 2020.03
A Power Converter System for Energy Harvesting Toward Zero Net Battery Power

Y. Sakamoto, H. Uchida, T. Tanzawa

IEICE general conference

Presentation date： 2020.03
A Design Window for Device Parameters of Rectifying Diodes in 2.4 GHz Micro-watt RF Energy Harvesting

Y. Yamazaki, M. Tsuchiaki, T. Tanzawa

IEEE Asia-Pacific Microwave Conference (APMC)

Presentation date： 2019.12
A 2V 3.8μW Fully-Integrated Clocked AC-DC Charge Pump with 0.5V 500Ω Vibration Energy Harvester

H. Kawauchi, T. Tanzawa

IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

Presentation date： 2019.11
A Pre-Emphasis Pulse Generator Insensitive to Process Variation for Driving Large Memory and Panel Display Arrays with Minimal Delay Time

K. Matsuyama, T. Tanzawa

IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

Presentation date： 2019.11
Design of Pre-Emphasis Pulses for Large Memory Arrays with Minimal Word-Line Delay Time

K. Matsuyama, T. Tanzawa

IEEE International Symposium on Circuits and Systems (ISCAS)

Presentation date： 2019.05
Toward a minimum-operating-voltage design of DC-DC charge pump circuits for energy harvesting

S. Tokuda, T. Tanzawa

IEEE International Symposium on Circuits and Systems (ISCAS)

Presentation date： 2019.05
A Sensitivity Analysis of Power Conversion Efficiency of Rectifying Diodes on Their Device Parameters for Microwatt RF Energy Harvesting

Y. Yamazaki, T. Tanzawa

IEICE general conference

Presentation date： 2019.03
An Optimum Design of Micro-watt RF Energy Harvesters with RF-DC and DC-DC Conversions

Y. Tabuchi, T. Tanzawa

IEICE general conference

Presentation date： 2019.03
An Optimum Design of Thermal Energy Transducers and Power Converters for Small Form-Factor Thermoelectric Energy Harvester

K. Koketsu, T. Tanzawa

IEICE general conference

Presentation date： 2019.03
A Design of AC-DC Converters Fully Integrated in Standard CMOS for Electrostatic Vibration Energy Harvesting

Y. Ishida, T. Tanzawa

IEICE general conference

Presentation date： 2019.03
(Invited) Interface Circuit Design for Energy Harvesting: State of the Art and Challenges

T. Tanzawa [Invited]

IEICE society conference, CI-3-1

Presentation date： 2018.09
Formulation of minimal delay time with pre-emphasis pulses for dense parallel RC lines

K. Matsuyama, T. Tanzawa

IEICE society conference, C-12-5

Presentation date： 2018.09
A system design of clocked AC-DC converter for vibration energy harvesting

H. Kawauchi, T. Tanzawa

IEICE society conference, C-12-9

Presentation date： 2018.09
A closed-form expression for pre-emphasis pulses with minimal RC delay time

K. Matsuyama, T. Tanzawa

IEICE general conference, C-12-35

Presentation date： 2018.03
Toward a minimum-operating-voltage design of DC-DC charge pump circuits for energy harvesting

S. Tokuda, T. Tanzawa

IEICE general conference, C-12-18

Presentation date： 2018.03
An analysis on lower bounds of supply voltages for enhanced-swing Colpitts oscillators

Y. Kawakami, T. Tanzawa

IEICE general conference, C-12-17

Presentation date： 2018.03
A clocked AC-DC voltage multiplier for increasing the power conversion efficiency in vibration energy harvesting

H. Kawauchi, T. Tanzawa

IEICE general conference, C-12-16

Presentation date： 2018.03
On-Chip Switched-Capacitor DC-DC Converter in Memory Technology: State of the Art and Challenges

T. Tanzawa

IEEE ECCTD (European Conference on Circuit Theory and Design)

Presentation date： 2017.09
Design Challenge in 3D NAND Technology: a 4.8X Area- and 1.3X Power-Efficient 20V Charge Pump Using Tier Capacitors

T. Tanzawa

IEEE Asian Solid-State Circuits Conference

Presentation date： 2016.11
A 768Gb 3b/cell 3D-floating-gate NAND flash memory

T. Tanaka, T., M. Helm, T. Tanzawa

ISSCC

Presentation date： 2016.02
An Analytical Model of Multi-Sine AC-DC Voltage Multiplier

T. Tanzawa

IEEE International Conference on Circuits and Systems

Presentation date： 2015.05
A Comprehensive Optimization Methodology for Designing Charge Pump Voltage Multipliers

T. Tanzawa

IEEE International Conference on Circuits and Systems

Presentation date： 2015.05
Design of DC-DC Switched-Capacitor Voltage Multiplier driven by DC Energy Transducer

T. Tanzawa

IEEE International Conference on Electronics Circuits and Systems

Presentation date： 2014.12
An Analytical Model of AC-DC Voltage Multipliers

T. Tanzawa

IEEE International Conference on Electronics Circuits and Systems

Presentation date： 2014.12
A temperature compensation word-line voltage generator for multi-level cell NAND Flash memories

T. Tanzawa

IEEE ESSCIRC

Presentation date： 2010.09
NBTI stress relaxation design for scaling high-voltage transistors in NAND Flash memories

T. Tanzawa

IEEE International Memory Workshop

Presentation date： 2010.08
Dickson charge pump circuit design with parasitic resistance in power lines

T. Tanzawa

IEEE International Conference on Circuits and Systems

Presentation date： 2009.05
A 172mm2 32Gb MLC NAND flash memory in 34nm CMOS

R. Zeng

IEEE International Solid-State Circuits Conference

Presentation date： 2009.01
A process- and temperature-tolerant power-on reset circuit with a flexible detection level higher than the bandgap voltage

T. Tanzawa

IEEE International Conference on Circuits and Systems

Presentation date： 2008.01
A low-IF CMOS single-chip Bluetooth EDR transmitter with digital I/Q mismatch trimming circuit

D. Miyashita

Symposium on VLSI Circuits

Presentation date： 2005.06
A temperature-compensated CMOS LC-VCO enabling the direct modulation architecture in 2.4GHz GFSK transmitter

T. Tanzawa

IEEE Custom Integrated Circuits Conference

Presentation date： 2004.09
A 44mm2 4-bank 8-word page read 64Mb flash memory with flexible block redundancy and fast accurate word-line voltage controller

T. Tanzawa

IEEE International Solid-State Circuits Conference

Presentation date： 2002.02
A channel-erasing 1.8 V-only 32 Mb NOR flash EEPROM with a bit-line direct-sensing scheme

S. Atsumi

IEEE International Solid-State Circuits Conference

Presentation date： 2000.02
A sampling weak-program method to tighten Vth-distribution of 0.5 V for low-voltage flash memories

H. Shiga

Symposium on VLSI Circuits

Presentation date： 1999.06
Novel 0.44 μm2 Ti-salicide STI cell technology for high-density NOR flash memories and high performance embedded application

H. Watanabe

IEEE International Electron Devices Meeting

Presentation date： 1998.12
A CMOS band-gap reference circuit with sub 1 V operation

H. Banba

IEEE Symposium on VLSI Circuits

Presentation date： 1998.06
A novel isolation-scaling technology for NAND EEPROMs with the minimized program disturbance

S. Satoh

IEEE IEDM

Presentation date： 1997.12
A 3.4-Mbyte/sec Programming 3-level NAND Flash Memory Saving 40% Die Size Per Bit

T. Tanaka

IEEE Symposium on VLSI Circuits

Presentation date： 1997.06
A Multi-page Cell Architecture For High-speed Programming Multi-level NAND Flash Memories

K. Takeuchi

IEEE Symposium on VLSI Circuits

Presentation date： 1997.06
Circuit Technologies For A Single-1.8V Flash Memory

T. Tanzawa

IEEE Symposium on VLSI Circuits

Presentation date： 1997.06
A compact on-chip ECC for low cost flash memories

T. Tanzawa

IEEE Symposium on VLSI Circuits

Presentation date： 1996.06
A stable programming pulse generator for high-speed programming single power supply voltage flash memories

T. Tanzawa

IEEE Symposium on VLSI Circuits

Presentation date： 1995.01
A Quick Boosting Charge Pump Circuit for High Density and Low Voltage Flash Memories

T. Tanzawa

IEEE Symposium on VLSI Circuits

Presentation date： 1994.06

▼display all

Research Projects

極低電圧から昇圧可能な電力変換回路の動作原理解明とIoT端末への応用

日本学術振興会基盤研究(C)

Project Year :

2022.04

-

2025.03

丹沢徹

Misc

An Adaptive PWM Scheme for Fast Ramp-Up DC-DC Boost Converters in SSD Applications

Yuji Kanayama, Toru Tanzawa

2025.05

Authorship：Corresponding author

DOI
Address-Dependent Divided-Bit-Line NAND Flash Memory for Reduction in Latency and Energy

Yuta Sugisawa, Toru Tanzawa

2024.08

Authorship：Last author, Corresponding author

DOI
Evolution of Reconfigurable Switched-Capacitor DC-DC Converters

Toru Tanzawa

2024.08

Authorship：Lead author, Last author, Corresponding author

DOI
What I have learned through the research on integrated charge pump circuits

丹沢徹

101 ( 3 ) 320 - 324 2018.03
Innovation of Switched-Capacitor Voltage Multiplier: Part 3: State of the Art of Switching Circuits and Applications of Charge Pumps

T. Tanzawa

IEEE Solid-State Circuits Magazine vol. 8 ( No. 3 ) 63 - 73 2016.08
Innovation of Switched-Capacitor Voltage Multiplier: Part 2: Fundamentals of the charge pump

T. Tanzawa

IEEE Solid-State Circuits Magazine vol. 8 ( No. 2 ) 83 - 92 2016.06
Innovation of Switched-Capacitor Voltage Multiplier: Part 1: A Brief History

T. Tanzawa

IEEE Solid-State Circuits Magazine vol. 8 ( No. 1 ) 51 - 59 2016.01

▼display all

Industrial Property Rights

昇圧回路及び電源装置

特許第7356713号

丹沢徹, 野村達也

Patent

J-GLOBAL
駆動回路及び電子デバイス

特許第7351532号

丹沢徹, 松山和樹

Patent

J-GLOBAL
レクテナ装置及びレクテナ装置を設計する方法

特許第7290219号

丹沢徹, 田渕侑幹

Patent

J-GLOBAL
電源装置及び電源システム

丹沢徹, 内田秀樹

Patent
電力変換装置及び電源装置

特許第7165997号

丹沢徹

Patent

J-GLOBAL
電源装置、昇圧回路の制御装置、及び昇圧回路の出力評価装置

丹沢徹, 内田秀樹, 濃野公一

Patent

J-GLOBAL
電源装置

丹沢徹, 内田秀樹

Patent
半導体装置及びその製造方法

特許第7109795号

丹沢徹

Patent

J-GLOBAL
ソースのエッジに隣接するソースコンタクトを有するメモリアレイを含む装置

特許第7053548号

丹沢徹

Patent

J-GLOBAL
昇圧回路及び電源装置

丹沢徹, 野村達也

Patent

J-GLOBAL
メモリセル内で負のボディ電位を確立することを含む装置および方法

特許第6934048号

作井康司, ホーズ,マーク, 丹沢徹, ビンフェット,ジェレミー

Patent

J-GLOBAL
メモリアクセス動作中に、メモリの複数のメモリプレーンに同時にアクセスするための装置および方法

特許第6931674号

ラジェード,シャンタヌアール., カラヴァド,プラナフ, 丹沢徹

Patent

J-GLOBAL
読み出し回路及びメモリシステム

丹沢徹

Patent
レクテナ装置及びレクテナ装置を設計する方法

丹沢徹, 田渕侑幹

Patent

J-GLOBAL
電源装置、昇圧回路の制御装置、及び昇圧回路の出力評価装置

丹沢徹, 内田秀樹, 濃野公一

Patent
ランダムアクセス型メモリ回路及びメモリシステム

丹沢徹

Patent
Semiconductor device and manufacturing method for same

US 11,258,008

Toru Tanzawa

Patent
駆動回路及び電子デバイス

丹沢徹, 松山和樹

Patent

J-GLOBAL
ソースのエッジに隣接するソースコンタクトを有するメモリアレイを含む装置

丹沢徹

Patent

J-GLOBAL
ランダムアクセス型メモリ回路及びメモリシステム

丹沢徹

Patent
昇圧回路及び電源装置

丹沢徹, 野村達也

Patent
メモリセル内で負のボディ電位を確立することを含む装置および方法

作井康司, ホーズ,マーク, 丹沢徹, ビンフェット,ジェレミー

Patent

J-GLOBAL
電力変換回路及び電源装置

丹沢徹

Patent

J-GLOBAL
インピーダンス調整回路、電力変換素子及び電源素子

丹沢徹

Patent

J-GLOBAL
電源装置

丹沢徹, 内田秀樹

Patent
ソースのエッジに隣接するソースコンタクトを有するメモリアレイを含む装置

特許第6599880号

丹沢徹

Patent

J-GLOBAL
メモリアクセス動作中に、メモリの複数のメモリプレーンに同時にアクセスするための装置および方法

ラジェード,シャンタヌアール., カラヴァド,プラナフ, 丹沢徹

Patent

J-GLOBAL
レクテナ装置及びレクテナ装置を設計する方法

丹沢徹, 田渕侑幹

Patent
電力変換装置及び電源装置

丹沢徹

Patent

J-GLOBAL
インピーダンス調整回路、電力変換素子及び電源素子

丹沢徹

Patent
半導体装置及びその製造方法

丹沢徹

Patent

J-GLOBAL
電力変換装置及び電源装置

丹沢徹

Patent
駆動回路及び電子デバイス

丹沢徹, 松山和樹

Patent
消去デバイアスを用いてメモリを動作させる装置、及び方法

丹沢徹

Patent

J-GLOBAL
半導体装置及びその製造方法

丹沢徹

Patent
メモリアクセス動作中に、メモリの複数のメモリプレーンに同時にアクセスするための装置および方法

ラジェード,シャンタヌアール., カラヴァド,プラナフ, 丹沢徹

Patent

J-GLOBAL
電力変換回路及び電源装置

丹沢徹

Patent
インピーダンス調整回路、電力変換素子及び電源素子

丹沢徹

Patent
メモリセルの分散されたサブブロックにアクセスすることを伴う装置および方法

特許第6321650号

丹沢徹

Patent

J-GLOBAL
電力変換装置及び電源装置

丹沢徹

Patent
半導体装置及びその製造方法

7109795

丹沢徹

Patent
ソースのエッジに隣接するソースコンタクトを有するメモリアレイを含む装置

丹沢徹

Patent

J-GLOBAL
有効化回路を含むデバイスおよびシステム

特許第6047153号

丹沢徹, ガーラム,アリフェイズザリン

Patent

J-GLOBAL
多数の層を備える半導体装置および方法

特許第5894261号

丹沢徹

Patent

J-GLOBAL
メモリセルの分散されたサブブロックにアクセスすることを伴う装置および方法

丹沢徹

Patent

J-GLOBAL
コントロールゲートに挿通する接続部を有するメモリアレイ

丹沢徹, ムラコシタモツ, シムゴーダ,ディーパク

Patent

J-GLOBAL
車外監視装置

特許第4914233号

齋藤徹, 丹沢勉

Patent

J-GLOBAL
不揮発性半導体メモリ

丹沢徹, 渥美滋

Patent

J-GLOBAL
電圧調整系

特許第4565283号

丹沢徹

Patent

J-GLOBAL
電圧調整系

丹沢徹

Patent

J-GLOBAL
不揮発性半導体メモリ

特許第4398541号

高野芳徳, 丹沢徹, 田浦忠行, 宮葉武史, 渥美滋

Patent

J-GLOBAL
静電容量式水分センサ及びその製造方法

茗荷谷徹, 丹沢孝直, 高橋宏滋

Patent

J-GLOBAL
半導体集積回路

特許第4284343号

梅沢明, 高野芳徳, 丹沢徹

Patent

J-GLOBAL
高電圧スイッチング回路

特許第4199765号

丹沢徹

Patent

J-GLOBAL
車外監視装置

齋藤徹, 丹沢勉

Patent

J-GLOBAL
不揮発性半導体メモリ

特許第4157285号

丹沢徹, 渥美滋, 梅沢明, 田浦忠行, 志賀仁, 高野芳徳

Patent

J-GLOBAL
半導体装置

特許第4149637号

丹沢徹, 宮葉武史, 渥美滋

Patent

J-GLOBAL
半導体集積回路及び周波数変調装置

特許第4091576号

丹沢徹

Patent

J-GLOBAL
定電圧発生回路及び半導体記憶装置

特許第4090817号

丹沢徹, 梅沢明, 高野芳徳

Patent

J-GLOBAL
電圧減算回路及びそれを用いた強度検波回路

特許第4088247号

丹沢徹

Patent

J-GLOBAL
フラッシュメモリ

特許第4074029号

田中智晴, 柴田昇, 丹沢徹

Patent

J-GLOBAL
不揮発性半導体メモリ

特許第4047673号

丹沢徹, 渥美滋

Patent

J-GLOBAL
不揮発性メモリにおける読み取り・検証動作を生成する方法及び装置

丹沢徹

Patent

J-GLOBAL
半導体記憶装置

特許第4033438号

梅沢明, 渥美滋, 丹沢徹, 田浦忠行, 志賀仁, 高野芳徳

Patent

J-GLOBAL
記憶システム

特許第3999822号

丹沢徹, 田中智晴

Patent

J-GLOBAL
電圧発生回路

特許第3993354号

宮葉武史, 丹沢徹, 栗山正男

Patent

J-GLOBAL
不揮発性半導体記憶装置

特許第3990393号

ヘミンク・ゲルトヤン, 丹沢徹, 田中智晴

Patent

J-GLOBAL
高電圧スイッチング回路

丹沢徹

Patent

J-GLOBAL
信号強度検波回路およびそれを用いた増幅率制御システム。

特許第3971368号

丹沢徹, 濱田基嗣

Patent

J-GLOBAL
温度係数が小さいパワー・オン・リセットを生成する方法及び装置

丹沢徹

Patent

J-GLOBAL
温度補償された読み出し・検証動作をフラッシュ・メモリにおいて生成するための方法及び装置

丹沢徹

Patent

J-GLOBAL
バンド・ギャップ基準から可変出力電圧を生成する方法及び装置

丹沢徹

Patent

J-GLOBAL
ポンプ回路を有する半導体装置

特許第3908415号

丹沢徹, 渥美滋

Patent

J-GLOBAL
不揮発性半導体メモリ

特許第3906189号

丹沢徹

Patent

J-GLOBAL
不揮発性半導体メモリ

特許第3905979号

丹沢徹, 渥美滋, 番場博則, 山田誠司, 森誠一, 栗山正男, 大塚伸朗

Patent

J-GLOBAL
半導体記憶装置

丹沢徹, 梅沢明, 高野芳徳

Patent

J-GLOBAL
半導体集積回路

梅沢明, 高野芳徳, 丹沢徹

Patent

J-GLOBAL
半導体装置

特許第3892612号

渥美滋, 田浦忠行, 丹沢徹

Patent

J-GLOBAL
半導体記憶装置

特許第3886669号

丹沢徹, 渥美滋

Patent

J-GLOBAL
不揮発性半導体記憶装置

特許第3887064号

丹沢徹

Patent

J-GLOBAL
不揮発性半導体記憶装置

特許第3884420号

ヘミンク・ゲルトヤン, 丹沢徹, 田中智晴

Patent

J-GLOBAL
不揮発性半導体メモリ

丹沢徹, 渥美滋, 番場博則, 山田誠司, 森誠一, 栗山正男, 大塚伸朗

Patent

J-GLOBAL
不揮発性半導体メモリ

丹沢徹, 渥美滋, 番場博則, 山田誠司, 森誠一, 栗山正男, 大塚伸朗

Patent

J-GLOBAL
昇圧回路

特許第3872927号

丹沢徹

Patent

J-GLOBAL
半導体記憶装置

丹沢徹, 渥美滋

Patent

J-GLOBAL
記憶システム

特許第3866674号

丹沢徹, 田中智晴

Patent

J-GLOBAL
半導体集積回路

特許第3866481号

梅沢明, 高野芳徳, 丹沢徹

Patent

J-GLOBAL
遅延回路

特許第3857542号

丹沢徹

Patent

J-GLOBAL
半導体装置

特許第3857461号

丹沢徹, 栗山正男, 田浦忠行

Patent

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Nonvolatile semiconductor memory device capable of controlling mutual timing of write voltage pulse and transfer voltage pulse

6252798

Satoh; Shinji , Shirota; Riichiro, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory having column sub-selector layout pattern adaptable to miniaturization of memory cell

6256227

Atsumi; Shigeru , Umezawa; Akira , Tanzawa; Toru, Yamada; Seiji

Rights holder： Kabushiki Kaisha Toshiba

Patent
Pump circuit with reset circuitry

6278316

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device

6282117

Tanaka; Tomoharu, Ohuchi; Kazunori, Tanzawa; Toru, Takeuchi; Ken

Rights holder： Kabushiki Kaisha Toshiba

Patent
Quantum tunneling effect device and semiconductor composite substrate

6320220

Watanabe; Hiroshi, Yasuda; Naoki, Toriumi; Akira, Tanaka; Tomoharu , Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

6337825

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor integrated circuit device

6344764

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

6344996

Tanaka; Tomoharu , Nakamura; Hiroshi , Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory device having a function for controlling the range of distribution of memory cell threshold voltages and method of erasing data thereof

6351417

Shiga; Hitoshi , Tanzawa; Toru, Saito; Masanobu

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device

6363010

Tanaka; Tomoharu, Ohuchi; Kazunori, Tanzawa; Toru, Takeuchi; Ken

Rights holder： Kabushiki Kaisha Toshiba

Patent
Channel-erase nonvolatile semiconductor memory device

6373749

Atsumi; Shigeru , Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Pump circuit with active-mode and stand-by mode booster circuits

6429725

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory device controlling the range of distribution of memory cell threshold voltages

6434054

Shiga; Hitoshi, Tanzawa; Toru , Saito; Masanobu

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor device

6438034

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory

6442080

Tanzawa; Toru , Taura; Tadayuki, Kuriyama; Masao

Rights holder： Kabushiki Kaisha Toshiba

Patent
Channel-erase nonvolatile semiconductor memory device

6445618

Atsumi; Shigeru, Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Booster circuit for raising voltage by sequentially transferring charges from input terminals of booster units to output terminals thereof in response to clock signals having different phases

6456541

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Boosted voltage generating circuit and semiconductor memory device having the same

6487120

Tanzawa; Toru , Miyaba; Takeshi, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

6525964

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device with initialization circuit and control method thereof

6535427

Takano; Yoshinori, Tanzawa; Toru, Taura; Tadayuki

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device

6545909

Tanaka; Tomoharu, Ohuchi; Kazunori, Tanzawa; Toru, Takeuchi; Ken

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor storage apparatus

6552936

Shiga; Hitoshi, Takano; Yoshinori, Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor device

6567309

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Channel-erase nonvolatile semiconductor memory device

6577538

Atsumi; Shigeru, Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Level shifter for converting a voltage level and a semiconductor memory device having the level shifter

6600679

Tanzawa; Toru, Watanabe; Kentaro

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor device with a voltage regulator

6600692

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Boosted voltage generating circuit and semiconductor memory device having the same

6605986

Tanzawa; Toru, Miyaba; Takeshi, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Flash memory

6611938

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Booster circuit for raising voltage by sequentially transferring charges from input terminals of booster units to output terminals thereof in response to clock signals having different phases

6614699

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

6621738

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory device

6639837

Takano; Yoshinori, Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Channel-erase nonvolatile semiconductor memory device

6643183

Atsumi; Shigeru, Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory

6650570

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory having page mode with a plurality of banks

6671203

Tanzawa; Toru, Atsumi; Shigeru, Umezawa; Akira, Taura; Tadayuki, Shiga; Hitosh), Takano; Yoshinori

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor storage apparatus

6693818

Shiga; Hitoshi, Takano; Yoshinor), Tanzawa; Tor), Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device and method of retrieving faulty in the same

6711057

Taura; Tadayuki, Atsumi; Shigeru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory

6711066

Tanzawa; Toru, Taura; Tadayuki, Kuriyama; Masao

Rights holder： Kabushiki Kaisha Toshiba

Patent
Constant voltage generation circuit and semiconductor memory device

6734719

Tanzawa; Toru, Takano; Yoshinori

Rights holder： Kabushiki Kaisha Toshiba

Patent
High-speed data programmable nonvolatile semiconductor memory device

6762956

Mori; Seiichi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Boosted voltage generating circuit and semiconductor memory device having the same

6771547

Tanzawa; Toru, Miyaba; Takeshi, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Memory device pump circuit with two booster circuits

6781439

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory with a page mode

6781879

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device and current mirror circuit

6788601

Takano; Yoshinori, Atsumi; Shigeru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory having page mode with a plurality of banks

6795352

Tanzawa; Toru, Atsumi; Shigeru, Umezawa; Akira, Taura; Tadayuki, Shiga; Hitoshi, Takano; Yoshinori

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory

6801457

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory device

6807097

Takano; Yoshinori, Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory capable of generating read-mode reference current and verify-mode reference current from the same reference cell

6816413

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory

6816421

Tanzawa; Toru, Umezawa; Akira

Rights holder： Kabushiki Kaisha Toshiba

Patent
Fast data readout semiconductor storage apparatus

6826068

Shiga; Hitoshi, Takano; Yoshinori, Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device with first and second read modes

6842377

Takano; Yoshinori, Honda; Yasuhiko, Tanzawa; Toru, Kuriyama; Masao

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory device and method of retrieving faulty in the same

6850437

Taura; Tadayuki, Atsumi; Shigeru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Nonvolatile semiconductor memory

6856548

Tanzawa; Toru, Taura; Tadayuki, Kuriyama; Masao

Rights holder： Kabushiki Kaisha Toshiba

Patent
Non-volatile semiconductor memory

6865125

Tanzawa; Toru, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

6868013

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor device having switch circuit to supply voltage

6977850

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Boosted voltage generating circuit and semiconductor memory device having the same

6996024

Tanzawa; Toru, Miyaba; Takeshi, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device and current mirror circuit

6999365

Takano; Yoshinori, Atsumi; Shigeru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Direct frequency modulation apparatus which modulates frequency by applying data-dependent voltage to control terminal of voltage-controlled oscillator without mediacy of PLL, and communication system

7005936

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor device having switch circuit to supply voltage

7050339

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

7061807

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Current difference divider circuit

7071771

Takano; Yoshinori , Taura; Tadayuki, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Analog level shifter

7148734

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Boosted voltage generating circuit and semiconductor memory device having the same

7180796

Tanzawa; Toru, Miyaba; Takeshi, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Boosted voltage generating circuit and semiconductor memory device having the same

7203120

Tanzawa; Toru, Miyaba; Takeshi, Atsumi; Shigeru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Flash memory

7219285

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Voltage subtracting circuit carrying out voltage subtraction by converting input voltage into current, intensity detecting circuit, and semiconductor integrated circuit device using the same

7233190

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
High voltage switching circuit

7272046

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Method and apparatus for generating temperature-compensated read and verify operations in flash memories

7277355

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Semiconductor device having switch circuit to supply voltage

7336545

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

7349259

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor integrated circuit device and frequency modulation device

7474139

Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Method and apparatus for generating read and verify operations in non-volatile memories

7489556

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Flash memory

7509566

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Semiconductor memory device

7535762

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
High voltage switching circuit

7609554

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Semiconductor memory device

7649780

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Adjustable voltage regulator for providing a regulated output voltage

7764563

Tanzawa; Toru, Harrington; Peter B.

Rights holder： Micron Technology, Inc.

Patent
Compensation capacitor network for divided diffused resistors for a voltage divider

7902907

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Flash memory

7908529

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

7916544

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Semiconductor memory device

7952933

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Adjustable voltage regulator for providing a regulated output voltage

7957214

Tanzawa; Toru, Harrington; Peter B.

Rights holder： Micron Technology, Inc.

Patent
Method and apparatus for generating temperature-compensated read and verify operations in flash memories

7957215

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage trimming

8013579

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage regulator system

8026702

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Biasing system and method

8125829

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Semiconductor memory device

8154922

Tanaka; Tomoharu, Nakamura; Hiroshi, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Level shifting circuit

8184489

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

8194459

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Arrangement of pairs of NAND strings that share bitline contacts while utilizing distinct sources lines

8208305

Tanzawa; Toru

Rights holder： Intel Corporation

Patent
Devices for shielding a signal line over an active region

8253198

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage regulator system

8253396

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Flash memory

8365025

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Level shifting circuit

8446784

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage trimming

8466664

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

8537620

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage generation and adjustment in a memory device

8547746

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory array and data line architecture

8593869

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Biasing system and method

8611153

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory array data line selection

8619471

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Devices and systems including enabling circuits

8675420

Tanzawa; Toru, Ghalam; Ali Feiz Zarrin

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory write operation

8681561

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory devices and programming methods that program a memory cell with a data value, read the data value from the memory cell and reprogram the memory cell with the read data value

8743622

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory devices having data lines included in top and bottom conductive lines

8780631

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

8780638

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory with top and bottom data lines

8792263

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for transposing select gates

8796778

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Vertical memory with body connection

8797804

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory array with power-efficient read architecture

8811084

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Methods and apparatuses including a select transistor having a body region including monocrystalline semiconductor material and/or at least a portion of its gate located in a substrate

8837222

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Devices for shielding a signal line over an active region

8853778

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Semiconductor apparatus with multiple tiers of memory cells with peripheral transistors, and methods

8860117

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Compensating for off-current in a memory

8861274

Tanzawa; Toru

Rights holder： Intel Corporation

Patent
Apparatuses and methods involving accessing distributed sub-blocks of memory cells

8891305

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Three-dimensional devices having reduced contact length

8952482

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatus and methods for applying a non-zero voltage differential across a memory cell not involved in an access operation

8971117

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory read apparatus and methods

8976594

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Sharing support circuitry in a memory

8995188

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage generator circuit

9000836

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Biasing system and method

9019766

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Voltage generation and adjustment in a memory device

9025385

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory array data line selection

9030882

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Charge pump redundancy in a memory

9042180

Tanzawa; Toru, Tanaka; Tomoharu

Rights holder： Intel Corporation

Patent
Method of error correction of a memory

9053043

Tanaka; Tomoharu, Shibata; Noboru, Tanzawa; Toru

Rights holder： Kabushiki Kaisha Toshiba

Patent
Apparatuses and methods for coupling load current to a common source

9064551

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for transposing select gates

9064576

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods to control body potential in memory operations

9064577

Zhao; Han, Goda; Akira, Parat; Krishna K., Mauri; Aurelio Giancarlo, Liu; Haitao, Tanzawa; Toru, Yamada; Shigekazu, Sakui; Koji

Rights holder： Micron Technology, Inc.

Patent
Enable/disable of memory chunks during memory access

9064578

Tanzawa; Toru, Tamada; Satoru, Kawai; Koichi, Manabe; Tetsuji

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory array and data line architecture

9082485

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

9111591

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory having memory cell string and coupling components

9111620

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Short-checking methods

9136017

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Vertical memory with body connection

9171587

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory with top and bottom data lines

9177614

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory array with power-efficient read architecture

9208891

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for coupling load current to a common source

9224477

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

9257180

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Methods and apparatuses including a select transistor having a body region including monocrystalline semiconductor material and/or at least a portion of its gate located in a substrate

9263460

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses including memory arrays with source contacts adjacent edges of sources

9263461

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Independently selective tile group access with data structuring

9285997

Tanzawa; Toru

Rights holder： Intel Corporation

Patent
Apparatuses and methods including memory write operation

9299437

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Methods applying a non-zero voltage differential across a memory cell not involved in an access operation

9305656

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for measuring an electrical characteristic of a model signal line and providing measurement information

9318173

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods including memory array data line selection

9318211

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Compensating for off-current in a memory

9324443

Tanzawa; Toru

Rights holder： Intel Corporation

Patent
Short-checking methods

9330789

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Three-dimensional devices having reduced contact length

9343479

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory read apparatus and methods

9349470

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

9368216

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Programming a memory cell to a voltage to indicate a data value and after a relaxation time programming the memory cell to a second voltage to indicate the data value

9378823

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Devices and systems including enabling circuits

9401188

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods using dummy cells programmed to different states

9412451

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Current leakage reduction in 3D NAND memory

9424936

Toru Tanzawa, Akira Goda, Shigekazu Yamada, Hiroyuki Sanda

Rights holder： Intel Corporation

Patent
Sequential memory access operations

9430417

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Memory devices having data lines included in top and bottom conductive lines

9437253

Tanzawa; Toru

Rights holder： Micron Technology, Inc.

Patent
Enable/disable of memory chunks during memory access

9536582

Toru Tanzawa, Satoru Tamada, Koichi Kawai, Tetsuji Manabe

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods to control body potential in memory operations

9536618

Han Zhao, Akira Goda, Krishna K. Parat, Aurielo Giancarlo Mauri, Haitao Liu, Toru Tanzawa, Shigekazu Yamada, Koji Sakui

Rights holder： Micron Technology, Inc.

Patent
Memory array having connections going through control gates

9595533

Toru Tanzawa, Tamotsu Murakoshi, Deepak Thimmegowda

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for charging a global access line prior to accessing a memory

9607705

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Devices for shielding a signal line over an active region

9614516

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Voltage generator circuit

9641068

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Selectable memory access time

9646660

Toru Tanzawa

Rights holder： Intel Corporation

Patent
Apparatuses and methods using dummy cells programmed to different states

9697907

Toru Tanzawa, Aaron Yip

Rights holder： Micron Technology, Inc.

Patent
Semiconductor apparatus with multiple tiers, and methods

9704876

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Devices including memory arrays, row decoder circuitries and column decoder circuitries

9711224

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Methods and apparatuses including a select transistor having a body region including monocrystalline semiconductor material and/or at least a portion of its gate located in a substrate

9711514

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatus and methods of operating memory with erase de-bias

9711228

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Data line arrangement and pillar arrangement in apparatuses

9721960

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Chunk redundancy architecture for memory

9727417

Toru Tanzawa

Rights holder： Intel Corporation

Patent
Three-dimensional devices having reduced contact length

9728538

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

9747991

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory read apparatus and methods

9773564

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Segmented memory and operation

9773553

Toru Tanzawa, Han Zhao

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods involving accessing distributed sub-blocks of memory cells

9779791

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory having memory cell string and coupling components

9780110

Toru Tanzawa

Rights holder： Micron Technology

Patent
Connecting memory cells to a data line sequentially while applying a program voltage to the memory cells

9779819

Qiang Tang, Ramin Ghodsi, Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Sequential memory access operations

9778846

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

9786334

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory array with power-efficient read architecture

9842652

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods to control body potential in 3D non-volatile memory operations

9881686

Han Zhao, Akira Goda, Krishna K. Parat, Aurelio Giancarlo Mauri, Haitao Liu, Toru Tanzawa, Shigekazu Yamada, Koji Sakui

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

9881651

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for charging a global access line prior to accessing a memory

9892797

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Semiconductor device structures including staircase structures, and related methods and electronic systems

9905514

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for concurrently accessing multiple memory planes of a memory during a memory access operation

9910594

Shantanu R. Rajwade, Pranav Kalavade, Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Methods of operating memory under erase conditions

9953711

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Chunk redundancy architecture for memory

9996438

Toru Tanzawa

Rights holder： Intel Corporation

Patent
Devices including memory arrays, row decoder circuitries and column decoder circuitries

10014057

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses including memory arrays with source contacts adjacent edges of sources

10050049

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Methods including establishing a negative body potential in a memory cell

10049750

Koji Sakui, Mark Hawes, Toru Tanzawa, Jeremy Binfet

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods using dummy cells programmed to different states

10079064

Toru Tanzawa, Aaron Yip

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for charging a global access line prior to accessing a memory

10079063

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for measuring an electrical characteristic of a model signal line and providing measurement information

10083265

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory array with power-efficient read architecture

10090051

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Field effect transistors having a fin

10096696

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

10102914

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

10109325

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Connecting memory cells to a data line sequentially while applying a program voltage to the memory cells

10121544

Qiang Tang, Ramin Ghodsi, Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Three dimensional memory device with access signal triggering from voltage pump output levels

10127991

Toru Tanzawa

Rights holder： Intel Corporation

Patent
Methods of programming and sensing in a memory device

10153043

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory having memory cell string and coupling components

10163928

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory device including pass transistors in memory tiers

10170490

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods involving accessing distributed sub-blocks of memory cells

10170169

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods to control body potential in 3D non-volatile memory operations

10170196

Han Zhao, Akira Goda, Krishna K. Parat, Aurelio Giancarlo Mauri, Haitao Liu, Toru Tanzawa, Shigekazu Yamada, Koji Sakui

Rights holder： Micron Technology, Inc.

Patent
Apparatus and methods of operating memory for negative gate to body conditions

10170193

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory device including mixed non-volatile memory cell types

10203885

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory read apparatus and methods

10210940

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory devices with a transistor that selectively connects a data line to another data line

10224103

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Segmented memory and operation

10242742

Toru Tanzawa, Han Zhao

Rights holder： Micron Technology, Inc.

Patent
Devices including memory arrays, row decoder circuitries and column decoder circuitries

10262739

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods using dummy cells programmed to different states

10262745

Toru Tanzawa, Aaron Yip

Rights holder： Micron Technology, Inc.

Patent
Memory devices having selectively electrically connected data lines

10269431

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Sequential memory access operations

10282093

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

10304498

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Tier mode for access operations to 3D memory

10310734

Toru Tanzawa

Rights holder： Intel Corporation

Patent
Apparatuses and methods for charging a global access line prior to accessing a memory

10340015

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for measuring an electrical characteristic of a model signal line and providing measurement information

10354030

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory devices having selectively electrically connected data lines

10366759

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for concurrently accessing multiple memory planes of a memory during a memory access operation

10379738

Shantanu R. Rajwade, Pranav Kalavade, Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatus and methods including establishing a negative body potential in a memory cell

10453538

Koji Sakui, Mark Hawes, Toru Tanzawa, Jeremy Binfet

Rights holder： Micron Technology, Inc.

Patent
Memory having memory cell string and coupling components

10484718

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods to control body potential in 3D non-volatile memory operations

10490292

Han Zhao, Akira Goda, Krishna K. Parat, Aurelio Giancarlo Mauri, Haitao Liu, Toru Tanzawa, Shigekazu Yamada, Koji Sakui

Rights holder： Micron Technology, Inc.

Patent
Connecting memory cells to a data line sequentially while applying a read voltage to the memory cells and programming the read data to a single memory cell

10504599

Qiang Tang, Ramin Ghodsi, Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

10510420

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory device including mixed non-volatile memory cell types

10521130

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Field effect transistors having a fin

10573728

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Semiconductor apparatus with multiple tiers, and methods

10580790

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory read apparatus and methods

10580502

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Segmented memory and operation

10672477

Toru Tanzawa, Han Zhao

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for charging a global access line prior to accessing a memory

10685721

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Three-dimensional devices having reduced contact length

10692870

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Interconnections for 3D memory

10706895

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods involving accessing distributed sub-blocks of memory cells

10734049

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods using dummy cells programmed to different states

10741259

Toru Tanzawa, Aaron Yip

Rights holder： Micron Technology, Inc.

Patent
Methods of forming semiconductor device structures including staircase structures

10748918

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory array having connections going through control gates

10770470

Toru Tanzawa, Tamotsu Murakoshi, Deepak Thimmegowda

Rights holder： Micron Technology, Inc.

Patent
Memory device including pass transistors in memory tiers

10784269

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods to control body potential in 3D non-volatile memory operations

10796778

Han Zhao, Akira Goda, Krishna K. Parat, Aurelio Giancarlo Mauri, Haitao Liu, Toru Tanzawa, Shigekazu Yamada, Koji Sakui

Rights holder： Micron Technology, Inc.

Patent
Sequential memory access operations

10824336

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Segmented memory operation

10854293

Toru Tanzawa, Han Zhao

Rights holder： Micron Technology, Inc.

Patent
Apparatuses including memory arrays with source contacts adjacent edges of sources

10879255

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory device including mixed non-volatile memory cell types

10901623

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatus and methods including establishing a negative body potential in a memory cell

10916313

Koji Sakui, Mark Hawes, Toru Tanzawa, Jeremy Binfet

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for measuring an electrical characteristic of a model signal line and providing measurement information

10956642

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory read apparatus and methods

10964400

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

10998054

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Three-dimensional devices having reduced contact length

11018135

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Semiconductor apparatus with multiple tiers, and methods

11145673

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods for concurrently accessing multiple memory planes of a memory during a memory access operation

11182074

Shantanu R. Rajwade, Pranav Kalavade, Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Semiconductor device and manufacturing method for same

11258008

Toru Tanzawa

Rights holder： National University Corporation Shizuoka University

Patent
Interconnections for 3D memory

11276437

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Apparatuses and methods involving accessing distributed sub-blocks of memory cells

11282556

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory device including mixed non-volatile memory cell types

11347401

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Memory array having connections going through control gates

11398489

Toru Tanzawa, Tamotsu Murakoshi, Deepak Thimmegowda

Rights holder： Micron Technology, Inc.

Patent
Memory device including pass transistors in memory tiers

11417671

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Field effect transistors having a fin

11462629

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent
Random telegraph signal noise reduction scheme for semiconductor memories

11462277

Toru Tanzawa

Rights holder： Micron Technology, Inc.

Patent

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Syllabus

Topics in Fundamental Science and Engineering C

School of Fundamental Science and Engineering

2025 spring semester
Topics in Fundamental Science and Engineering C

School of Fundamental Science and Engineering

2025 spring semester
Topics in Fundamental Science and Engineering C

School of Fundamental Science and Engineering

2025 spring semester
Topics in Fundamental Science and Engineering C

School of Fundamental Science and Engineering

2025 spring semester
Topics in Fundamental Science and Engineering C

School of Fundamental Science and Engineering

2025 spring semester
Green Integrated Systems

Graduate School of Information, Production and Systems

2025 fall semester
Green Integrated Systems Research (Fall)

Graduate School of Information, Production and Systems

2025 fall semester
Green Integrated Systems D

Graduate School of Information, Production and Systems

2025 fall semester
Green Integrated Systems C

Graduate School of Information, Production and Systems

2025 spring semester
Green Integrated Systems B

Graduate School of Information, Production and Systems

2025 spring semester
Green Integrated Systems A

Graduate School of Information, Production and Systems

2025 fall semester
Semiconductor Device Technology and Engineering

Graduate School of Information, Production and Systems

2025 fall semester
Semiconductor Memory Technology and Engineering

Graduate School of Information, Production and Systems

2025 spring semester
Master's Thesis (Integrated Systems)(Spring)

Graduate School of Information, Production and Systems

2025 spring semester
Green Integrated Systems Research (Spring)

Graduate School of Information, Production and Systems

2025 spring semester
Master's Thesis (Integrated Systems)(Fall)

Graduate School of Information, Production and Systems

2025 fall semester
Integrated Circuit Engineering

Graduate School of Information, Production and Systems

2025 fall semester
Green Integrated Systems Research (Doctor's Thesis)

Graduate School of Information, Production and Systems

2025 full year
Green Integrated Systems Research (Fall)

Graduate School of Information, Production and Systems

2025 fall semester
Green Integrated Systems Research (Spring)

Graduate School of Information, Production and Systems

2025 spring semester

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Teaching Experience

Semiconductor Device Technology and Engineering

Waseda University
2024.10

-

Now
Integrated circuit engineering

Waseda University
2024.10

-

Now
Semiconductor Memory Technology and Engineering

Waseda University
2024.04

-

Now
電子回路II

静岡大学
電子回路I

静岡大学
電子回路Ⅰ

静岡大学
電気電子工学研究第二

静岡大学
電気電子工学研究第一

静岡大学
電気電子工学概論

静岡大学
電気電子工学セミナー第一

静岡大学
電気電子工学セミナー第ニ

静岡大学
電気回路Ⅰ

静岡大学
卒業研究

静岡大学
数値シミュレーション

静岡大学
集積回路工学

静岡大学
集積回路プロセス工学特論

静岡大学
集積プロセス・デバイス工学特論

静岡大学
セミナー１

静岡大学
キャリアデザイン
電気電子工学セミナー第二

静岡大学
社会と製造業

静岡大学
プロセッサ工学

静岡大学

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Research Institute

2024

-

2026

Waseda Research Institute for Science and Engineering Concurrent Researcher

Internal Special Research Projects

高電圧高出力抵抗または低電圧低出力抵抗の環境発電素子用電力変換回路の研究

2024

　View Summary

高電圧高出力抵抗環境発電素子用AC-DC電力変換回路のモデリングを行った。スイッチ・キャパシタ方式の複数の回路トポロジで解析を行い、それぞれの出力電力最大化設計方法を求めた。小型回路でも高電圧高出力抵抗の発電素子の発生電力をIoTセンサICへ供給することができることを示した。今後回路の試作と評価解析を行って、これらを含めて研究成果の内容を2025年度に発表する予定である。