Yoshikatsu Ryu

14 papers Journal 7Unranked 7
YearRankTypeTitle / Venue / Authors
2014 J jnl
A 0.6 V Input CCM/DCM Operating Digital Buck Converter in 40 nm CMOS.
IEEE J. Solid State Circuits
Xin Zhang, Po-Hung Chen, Yasuyuki Okuma, Koichi Ishida, Yoshikatsu Ryu, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya
2013 — conf
A low voltage buck DC-DC converter using on-chip gate boost technique in 40nm CMOS.
ASP-DAC
Xin Zhang, Po-Hung Chen, Yoshikatsu Ryu, Koichi Ishida, Yasuyuki Okuma, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya
2012 — conf
A 0.45-V input on-chip gate boosted (OGB) buck converter in 40-nm CMOS with more than 90% efficiency in load range from 2µW to 50µW.
VLSIC
Xin Zhang, Po-Hung Chen, Yoshikatsu Ryu, Koichi Ishida, Yasuyuki Okuma, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya
2012 J jnl
A 1-V-Input Switched-Capacitor Voltage Converter With Voltage-Reference-Free Pulse-Density Modulation.
IEEE Trans. Circuits Syst. II Express Briefs
Xin Zhang, Yu Pu, Koichi Ishida, Yoshikatsu Ryu, Yasuyuki Okuma, Po-Hung Chen, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya
2012 — conf
A 120-mV input, fully integrated dual-mode charge pump in 65-nm CMOS for thermoelectric energy harvester.
ASP-DAC
Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2012 J jnl
An 80 mV Startup Dual-Mode Boost Converter by Charge-Pumped Pulse Generator and Threshold Voltage Tuned Oscillator With Hot Carrier Injection.
IEEE J. Solid State Circuits
Po-Hung Chen, Xin Zhang, Koichi Ishida, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2012 J jnl
Startup Techniques for 95 mV Step-Up Converter by Capacitor Pass-On Scheme and V
IEEE J. Solid State Circuits
Po-Hung Chen, Koichi Ishida, Katsuyuki Ikeuchi, Xin Zhang, Kentaro Honda, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2011 J jnl
0.18-V Input Charge Pump with Forward Body Bias to Startup Boost Converter for Energy Harvesting Applications.
IEICE Trans. Electron.
Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2011 J jnl
0.5-V Input Digital Low-Dropout Regulator (LDO) with 98.7% Current Efficiency in 65 nm CMOS.
IEICE Trans. Electron.
Yasuyuki Okuma, Koichi Ishida, Yoshikatsu Ryu, Xin Zhang, Po-Hung Chen, Kazunori Watanabe, Makoto Takamiya, Takayasu Sakurai
2011 — conf
A 80-mV input, fast startup dual-mode boost converter with charge-pumped pulse generator for energy harvesting.
A-SSCC
Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2011 — conf
A 95mV-startup step-up converter with Vth-tuned oscillator by fixed-charge programming and capacitor pass-on scheme.
ISSCC
Po-Hung Chen, Koichi Ishida, Katsuyuki Ikeuchi, Xin Zhang, Kentaro Honda, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2011 J jnl
A Variable Output Voltage Switched-Capacitor DC-DC Converter with Pulse Density and Width Modulation (PDWM) for 57% Ripple Reduction at Low Output Voltage.
IEICE Trans. Electron.
Xin Zhang, Yu Pu, Koichi Ishida, Yoshikatsu Ryu, Yasuyuki Okuma, Po-Hung Chen, Takayasu Sakurai, Makoto Takamiya
2010 — conf
0.18-V input charge pump with forward body biasing in startup circuit using 65nm CMOS.
CICC
Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuaki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai
2010 — conf
0.5-V input digital LDO with 98.7% current efficiency and 2.7-µA quiescent current in 65nm CMOS.
CICC
Yasuyuki Okuma, Koichi Ishida, Yoshikatsu Ryu, Xin Zhang, Po-Hung Chen, Kazunori Watanabe, Makoto Takamiya, Takayasu Sakurai