Details of a Researcher - Ishikuro, Hiroki

Ishikuro, Hiroki

写真a

Affiliation: Faculty of Science and Technology, Department of Electronics and Electrical Engineering （Yagami）

Position: Professor

Related Websites

http://www.iskr.elec.keio.ac.jp/

External Links

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Career 【 Display / hide 】

1999.04

-

2006.03

(株)東芝 SoC研究開発センター
2006.04

-

2008.03

慶應義塾大学理工学部電子工学科, 専任講師
2008.04

-

2014.03

慶應義塾大学理工学部電子工学科, 准教授
2014.04

-

Present

慶應義塾大学理工学部電子工学科, 教授

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Academic Background 【 Display / hide 】

1994.03

The University of Tokyo, Faculty of Engineering, 電子工学科

University, Graduated
1996.03

The University of Tokyo, Graduate School, Division of Engineering, 電子工学

Graduate School, Completed, Master's course
1999.03

The University of Tokyo, Graduate School, Division of Engineering, 電子工学専攻

Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

工学, The University of Tokyo, Coursework, 1999.03

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Research Areas 【 Display / hide 】

Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment (LSI circuit design)

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Research Themes 【 Display / hide 】

Fundamental technologies for dependable VLSI system,

2009

-

2014

　View Summary

JST CRESTプロジェクトにて、高信頼ワイヤレス・ソリッド・ステート・ドライブ(SSD)用の非接触データ・電力伝送回路の研究を行っている
Extremely Low-power Circuits and Systems (Green IT Project),

2009

-

2012

　View Summary

0.5Vで動作するマイクロワットオーダーの極低電力アナログ回路および無線回路の研究を行っている。

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Papers 【 Display / hide 】

A Discrete-Time Model for Frequency Modulated Charge Pumps with Synchronized Controller

Tan Y., Ishikuro H.

Midwest Symposium on Circuits and Systems （Midwest Symposium on Circuits and Systems) 2020-August 929 - 932 2020.08

ISSN 9781538629161

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© 2020 IEEE. This paper presents a discrete-time based approach for frequency modulated charge pumps with synchronized controller. In order to handle the varying frequency, this paper first introduced a method to calculate the output voltage of an open-loop charge pump with predefined frequencies, which is improved from a fixed frequency open-loop model verified in previous research. Then a closed-loop model is proposed for synchronized frequency controllers. An algorithm is hence created from the closed-loop model to simulate the output of charge pumps. The simulation result shows a competitive accuracy and much faster speed when comparing it with transistor level simulations. Overall, this paper demonstrated its value in terms of modeling the frequency modulated charge pumps and hence assisted the top-down design flow.
- Access to Document (DOI)
A Wide Input-Range, Low-Power and Highly Flexible 18 Bit Time-to-Digital Converter with Compact Differential Circuit Topology

Toth P., Ishikuro H.

Midwest Symposium on Circuits and Systems （Midwest Symposium on Circuits and Systems) 2020-August 937 - 940 2020.08

ISSN 9781538629161

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© 2020 IEEE. This paper presents a wide-dynamic-range high-resolution time-domain converter concept tailored for low-power sensor interfaces. The unique system structure applies different techniques to reduce circuit complexity, power consumption, and noise sensitivity. A multi-cycle concept, which allows a virtual delay line extension, is applied to achieve high resolution down to 1 ns. At the same time, it expands the dynamic range drastically up to 2.35 ms. Moreover, individually tunable delay elements in the range of 1 ns to 12 ns allow on the one hand on-demand flexible operation in a low- or high-resolution mode for smart sensing applications and flexible power control. On the other hand, delay stage mismatch calibration. The concept of this paper is evaluated through both simulation and hardware by a custom-designed PCB using commercially available components. An HDL state machine operates as control logic on a generic FPGA. The presented concept is highly suitable for on-chip integration.
- Access to Document (DOI)
A digital-to-resistance converter with an automatic offset calibration method for evaluating dynamic performance of resistive sensor readout circuits

Nakagawa S., Miyazaki T., Ishikuro H.

I2MTC 2020 - International Instrumentation and Measurement Technology Conference, Proceedings （I2MTC 2020 - International Instrumentation and Measurement Technology Conference, Proceedings) 2020.05

ISSN 9781728144603

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© 2020 IEEE. In this paper, a digital-to-resistance converter (DRC) with automatic offset calibration circuits is proposed. This circuit is used to evaluate the dynamic performance of resistive sensor readout circuits. The proposed DRC consists of a digital-to-analog converter, an analog multiplier, a fixed-value reference resistor, and current sources. A wide-range resistance changing at high frequency is achieved with the proposed DRC. In order to minimize the resistance error caused by the offset voltage of op-amps, an automatic offset calibration method is proposed. This developed prototype DRC achieved 96.3 dB dynamic range, 56.1 dB SNDR at 10kHz, and a maximum operating frequency is 100kHz.
- Access to Document (DOI)
A linearity testing of cascaded analog mixed-signal blocks using SEIR method

Ishikawa T., Pai C.W., Ishikuro H.

I2MTC 2020 - International Instrumentation and Measurement Technology Conference, Proceedings （I2MTC 2020 - International Instrumentation and Measurement Technology Conference, Proceedings) 2020.05

ISSN 9781728144603

　View Summary

© 2020 IEEE. This paper proposes a method to separate distortions of the input signal, amplifier, and analog-to-digital converter (ADC), which are cascaded blocks in the testing of an analog front-end system. The proposed technique extends the stimulus error identification and removal (SEIR) method to separate the low-quality input test signal, the nonlinearity of amplifier and ADC. The system model was built by using MATLAB/Simulink, and the nonlinearity of the input signal with distortion, amplifier, and ADC were successfully separated. With a 12-bit ADC, the estimation error of each block is less than 1 LSB in the simulation, and the proposed method was verified by measurement. The relations between the estimation error, calculation cost and each parameter in the proposed method are systematically studied.
- Access to Document (DOI)
Low-Power and ppm-Level Multimolecule Detection by Integration of Self-Heated Metal Nanosheet Sensors

Tanaka T., Yanagida T., Uchida K., Tabuchi K., Tatehora K., Shiiki Y., Nakagawa S., Takahashi T., Shimizu R., Ishikuro H., Kuroda T.

IEEE Transactions on Electron Devices （IEEE Transactions on Electron Devices) 66 （ 12 ） 5393 - 5398 2019.12

ISSN 00189383

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© 1963-2012 IEEE. H2 and NH3 detection with low power consumption was demonstrated by integrated chemiresistive Pt and PtRh nanosheet sensors on glass substrates. The self-heating effects realized low power and local heating of metal nanosheet sensors, enabling the integration of sensors with different operating temperatures. Based on different resistance changes in Pt and PtRh nanosheets toward H2 and NH3, the concentration of each gas was detected from a gas mixture by consuming around 1-mW power. For decreasing the power consumption and further integration of sensors, sensor scaling and pulsed operations were numerically and experimentally studied. In addition to good connectivity of metal nanosheet sensors to large-scale integration (LSI) circuits, improvements of the power consumption by sensor scaling were proven. The pulsed operations required for integrated sensor arrays maintained a sensor response, or a resistance change, of approximately 60%, even when the power consumption was reduced by 20%.
- Access to Document (DOI)

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Papers, etc., Registered in KOARA 【 Display / hide 】

Study on calibration technique of large scale mixed-signal integrated circuits

Ishikuro, Hiroki

科学研究費補助金研究成果報告書 2010

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Presentations 【 Display / hide 】

Voltage-Boosting Wireless Power Delivery System With Fast Load Tracker by ΔΣ-Modulated Sub-Harmonic Resonant Switching

Ryota Shinoda, Kazutoshi Tomita, Yuya Hasegawa, and Hiroki Ishikuro

2012 IEEE International Solid-State Circuits Conference (ISSCC) (San Francisco, USA) ,

2012.02
,
Oral presentation (general), IEEE
A 0.7V 4.1mW 850Mbps/ch Inductive-Coupling Transceiver with Adaptive Pulse Width Controller in 65nm CMOS

Takeshi Matsubara, Isamu Hayashi, Abul Hasan Johari, Tadahiro Kuroda, and Hiroki Ishikuro

2012 IEEE Radio and Wireless Symposium(RWS (Santa Clara, California, USA) ,

2012.01
,
Oral presentation (general), IEEE
1W 3.3V-to-16.3V Boosting Wireless Power Transfer Circuits with Vector Summing Power Controller

Kazutoshi Tomita, Ryota Shinoda, Tadahiro Kuroda, and Hiroki Ishikuro

IEEE Asian Solid-State Circuits Conference (ASSCC) (Jeju, Korea) ,

2011.11
,
Oral presentation (general), IEEE
A 40nm 50S/S - 8MS/S Ultra Low-Voltage SAR ADC with Timing Optimized Asynchronous Clock Generator

R.Sekimoto, A.Shikata, T.Kuroda, H.Ishikuro

37th Solid-State Circuits Conference (ESSCIRC) (Helsinki, Finland) ,

2011.09
,
Oral presentation (general), IEEE
A 0.5V 1.1MS/sec 6.3fJ/conversion-step SAR-ADC with Tri-Level Comparator in 40nm CMOS

Akira Shikata, Ryota Sekimoto, Tadahiro Kuroda, and Hiroki Ishikuro

VLSIシンポジウム報告会 (東京) ,

2011.07
,
Oral presentation (general), IEEE

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Intellectual Property Rights, etc. 【 Display / hide 】

半導体集積回路装置およびそれを用いた無線通信装置

Date applied： 2005-362281 2005.12

Date announced： 2006-197571 2006.07

Patent, Joint
半導体装置

Date applied： 2004-252795 2004.08

Date announced： 2006-74212 2006.03

Patent, Joint
半導体集積回路装置

Date applied： 2002-108081 2004.04

Date announced： 2003-304167 2003.10

Patent, Joint
FMディジタル復調器

Date applied： 2001-220801 2001.07

Date announced： 2003-37442 2003.02

Patent
適応型イメージ除去ミキサ

Date issued： 6859648 2005.02

Patent, Joint

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Awards 【 Display / hide 】

LSI IPデザインアワード

ISHIKURO HIROKI, 2007.04, 財団法人電気・電子情報学術振興財団, 磁界結合パルス伝送方式を用いた高速無線インターフェースの設計とファームウェアデバッグシステムへの応用

Type of Award： Award from publisher, newspaper, foundation, etc.

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