Keishi Tsubaki

13 papers Journal 4Unranked 9
YearRankTypeTitle / Venue / Authors
2018 J jnl
A Sub-1-µs Start-Up Time, Fully-Integrated 32-MHz Relaxation Oscillator for Low-Power Intermittent Systems.
IEICE Trans. Electron.
Hiroki Asano, Tetsuya Hirose, Taro Miyoshi, Keishi Tsubaki, Toshihiro Ozaki, Nobutaka Kuroki, Masahiro Numa
2017 — conf
Sub-1-μs start-up time, 32-MHz relaxation oscillator for low-power intermittent VLSI systems.
ASP-DAC
Hiroki Asano, Tetsuya Hirose, Taro Miyoshi, Keishi Tsubaki, Toshihiro Ozaki, Nobutaka Kuroki, Masahiro Numa
2016 — conf
A 1.66-nW/kHz, 32.7-kHz, 99.5ppm/°C fully integrated current-mode RC oscillator for real-time clock applications with PVT stability.
ESSCIRC
Hiroki Asano, Tetsuya Hirose, Keishi Tsubaki, Taro Miyoshi, Toshihiro Ozaki, Nobutaka Kuroki, Masahiro Numa
2016 J jnl
A Highly Efficient Switched-Capacitor Voltage Boost Converter with Nano-Watt MPPT Controller for Low-Voltage Energy Harvesting.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Toshihiro Ozaki, Tetsuya Hirose, Takahiro Nagai, Keishi Tsubaki, Nobutaka Kuroki, Masahiro Numa
2016 — conf
A fully integrated, 1-µs start-up time, 32-MHz relaxation oscillator for low-power intermittent systems.
NEWCAS
Hiroki Asano, Tetsuya Hirose, Taro Miyoshi, Keishi Tsubaki, Toshihiro Ozaki, Nobutaka Kuroki, Masahiro Numa
2015 — conf
A 0.21-V minimum input, 73.6% maximum efficiency, fully integrated 3-terminal voltage converter with MPPT for low-voltage energy harvesters.
ASP-DAC
Toshihiro Ozaki, Tetsuya Hirose, Takahiro Nagai, Keishi Tsubaki, Nobutaka Kuroki, Masahiro Numa
2015 J jnl
A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs.
IEICE Trans. Electron.
Keishi Tsubaki, Tetsuya Hirose, Nobutaka Kuroki, Masahiro Numa
2014 — conf
A 0.21-V minimum input, 73.6% maximum efficiency, fully integrated voltage boost converter with MPPT for low-voltage energy harvesters.
ESSCIRC
Toshihiro Ozaki, Tetsuya Hirose, Takahiro Nagai, Keishi Tsubaki, Nobutaka Kuroki, Masahiro Numa
2014 J jnl
A Fully On-Chip, 6.66-kHz, 320-nA, 56ppm/°C, CMOS Relaxation Oscillator with PVT Variation Compensation Circuit.
IEICE Trans. Electron.
Keishi Tsubaki, Tetsuya Hirose, Yuji Osaki, Seiichiro Shiga, Nobutaka Kuroki, Masahiro Numa
2013 — conf
A 32.55-kHz, 472-nW, 120ppm/°C, fully on-chip, variation tolerant CMOS relaxation oscillator for a real-time clock application.
ESSCIRC
Keishi Tsubaki, Tetsuya Hirose, Nobutaka Kuroki, Masahiro Numa
2012 — conf
A 6.66-kHz, 940-nW, 56ppm/°C, fully on-chip PVT variation tolerant CMOS relaxation oscillator.
ICECS
Keishi Tsubaki, Tetsuya Hirose, Yuji Osaki, Seiichiro Shiga, Nobutaka Kuroki, Masahiro Numa
2012 — conf
A low-power single-slope analog-to-digital converter with digital PVT calibration.
ICECS
Yuji Osaki, Tetsuya Hirose, Keishi Tsubaki, Nobutaka Kuroki, Masahiro Numa
2011 — conf
A 18.9-nA standby current comparator with adaptive bias current generator.
A-SSCC
Kosuke Isono, Tetsuya Hirose, Keishi Tsubaki, Nobutaka Kuroki, Masahiro Numa