Koichi ISHIDA


EMI Camera LSI (EMcam) with On-Chip Loop Antenna Matrix to Measure EMI Noise Spectrum and Distribution
Naoki MASUNAGA Koichi ISHIDA Takayasu SAKURAI Makoto TAKAMIYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/06/01
Vol. E95-C  No. 6  pp. 1059-1066
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
electromagnetic interferenceon-chip loop antennadown-conversionnoise distribution
 Summary | Full Text:PDF(5.2MB)

0.5-V Input Digital Low-Dropout Regulator (LDO) with 98.7% Current Efficiency in 65 nm CMOS
Yasuyuki OKUMA Koichi ISHIDA Yoshikatsu RYU Xin ZHANG Po-Hung CHEN Kazunori WATANABE Makoto TAKAMIYA Takayasu SAKURAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Vol. E94-C  No. 6  pp. 938-944
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
low dropout regulatordigital controllow voltage
 Summary | Full Text:PDF(1.3MB)

A Variable Output Voltage Switched-Capacitor DC-DC Converter with Pulse Density and Width Modulation (PDWM) for 57% Ripple Reduction at Low Output Voltage
Xin ZHANG Yu PU Koichi ISHIDA Yoshikatsu RYU Yasuyuki OKUMA Po-Hung CHEN Takayasu SAKURAI Makoto TAKAMIYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Vol. E94-C  No. 6  pp. 953-959
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
DC-DC converterlow ripplelow voltagepulse density modulationpulse width modulationswitched-capacitor
 Summary | Full Text:PDF(2MB)

0.18-V Input Charge Pump with Forward Body Bias to Startup Boost Converter for Energy Harvesting Applications
Po-Hung CHEN Koichi ISHIDA Xin ZHANG Yasuyuki OKUMA Yoshikatsu RYU Makoto TAKAMIYA Takayasu SAKURAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/04/01
Vol. E94-C  No. 4  pp. 598-604
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
charge pumpsswitched capacitorstartupboost converterlow voltage
 Summary | Full Text:PDF(2MB)

Inductor and TSV Design of 20-V Boost Converter for Low Power 3D Solid State Drive with NAND Flash Memories
Tadashi YASUFUKU Koichi ISHIDA Shinji MIYAMOTO Hiroto NAKAI Makoto TAKAMIYA Takayasu SAKURAI Ken TAKEUCHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/03/01
Vol. E93-C  No. 3  pp. 317-323
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
SSDboost convertercharge pumpinductor designTSV's
 Summary | Full Text:PDF(1.3MB)

Difficulty of Power Supply Voltage Scaling in Large Scale Subthreshold Logic Circuits
Tadashi YASUFUKU Taro NIIYAMA Zhe PIAO Koichi ISHIDA Masami MURAKATA Makoto TAKAMIYA Takayasu SAKURAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/03/01
Vol. E93-C  No. 3  pp. 332-339
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
minimum operating voltagesubthresholdlogicvariationsbody bias
 Summary | Full Text:PDF(1MB)

A 100 Mbps, 4.1 pJ/bit Threshold Detection-Based Impulse Radio UWB Transceiver in 90 nm CMOS
Lechang LIU Yoshio MIYAMOTO Zhiwei ZHOU Kosuke SAKAIDA Jisun RYU Koichi ISHIDA Makoto TAKAMIYA Takayasu SAKURAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2009/06/01
Vol. E92-C  No. 6  pp. 769-776
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
impulse radio ultra-wideband (IR-UWB)digital pulse-shapingpulse discriminatorerror-recovery phase-frequency detector
 Summary | Full Text:PDF(1010.1KB)

An Outside-Rail Opamp Design Relaxing Low-Voltage Constraint on Future Scaled Transistors
Koichi ISHIDA Atit TAMTRAKARN Hiroki ISHIKURO Makoto TAKAMIYA Takayasu SAKURAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/04/01
Vol. E90-C  No. 4  pp. 786-792
Type of Manuscript:  Special Section PAPER (Special Section on Low-Power, High-Speed LSIs and Related Technologies)
Category: Analog and Communications
Keyword: 
outside-railopampscaling
 Summary | Full Text:PDF(759.8KB)