Keishi TSUBAKI


A Sub-1-µs Start-Up Time, Fully-Integrated 32-MHz Relaxation Oscillator for Low-Power Intermittent Systems
Hiroki ASANO Tetsuya HIROSE Taro MIYOSHI Keishi TSUBAKI Toshihiro OZAKI Nobutaka KUROKI Masahiro NUMA 
Publication:   
Publication Date: 2018/03/01
Vol. E101-C  No. 3  pp. 161-169
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
relaxation oscillatorfast start-updigital signal processinghigh accuracyintermittent operationPVT variations
 Summary | Full Text:PDF(2.4MB)

A Highly Efficient Switched-Capacitor Voltage Boost Converter with Nano-Watt MPPT Controller for Low-Voltage Energy Harvesting
Toshihiro OZAKI Tetsuya HIROSE Takahiro NAGAI Keishi TSUBAKI Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/12/01
Vol. E99-A  No. 12  pp. 2491-2499
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: 
Keyword: 
energy harvestingDC-DC convertercharge pumpMPPTlow-power
 Summary | Full Text:PDF(3.8MB)

A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs
Keishi TSUBAKI Tetsuya HIROSE Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/05/01
Vol. E98-C  No. 5  pp. 446-453
Type of Manuscript:  PAPER
Category: Integrated Electronics
Keyword: 
ROSCRTCoscillatorcomparatorPVT variationlow-power
 Summary | Full Text:PDF(2.2MB)

A Fully On-Chip, 6.66-kHz, 320-nA, 56ppm/°C, CMOS Relaxation Oscillator with PVT Variation Compensation Circuit
Keishi TSUBAKI Tetsuya HIROSE Yuji OSAKI Seiichiro SHIGA Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/06/01
Vol. E97-C  No. 6  pp. 512-518
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
ROSCRTCoscillatorcomparatorPVT variationlow-power
 Summary | Full Text:PDF(2.3MB)