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ORCIDKoichi Ishida
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Publications
- 2014
[j21]Xin Zhang, Po-Hung Chen, Yasuyuki Okuma, Koichi Ishida, Yoshikatsu Ryu, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya:
A 0.6 V Input CCM/DCM Operating Digital Buck Converter in 40 nm CMOS. IEEE J. Solid State Circuits 49(11): 2377-2386 (2014)- 2013
- [c29]Xin Zhang, Po-Hung Chen, Yoshikatsu Ryu, Koichi Ishida, Yasuyuki Okuma, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya:
A low voltage buck DC-DC converter using on-chip gate boost technique in 40nm CMOS. ASP-DAC 2013: 109-110 - 2012
- [j16]Po-Hung Chen, Koichi Ishida, Katsuyuki Ikeuchi, Xin Zhang, Kentaro Honda, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
Startup Techniques for 95 mV Step-Up Converter by Capacitor Pass-On Scheme and VTH-Tuned Oscillator With Fixed Charge Programming. IEEE J. Solid State Circuits 47(5): 1252-1260 (2012) - [j15]Po-Hung Chen, Xin Zhang, Koichi Ishida, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
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 47(11): 2554-2562 (2012) - [j14]Xin Zhang, Yu Pu, Koichi Ishida, Yoshikatsu Ryu, Yasuyuki Okuma, Po-Hung Chen, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya:
A 1-V-Input Switched-Capacitor Voltage Converter With Voltage-Reference-Free Pulse-Density Modulation. IEEE Trans. Circuits Syst. II Express Briefs 59-II(6): 361-365 (2012) - [c25]Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
A 120-mV input, fully integrated dual-mode charge pump in 65-nm CMOS for thermoelectric energy harvester. ASP-DAC 2012: 469-470 - [c23]Xin Zhang, Po-Hung Chen, Yoshikatsu Ryu, Koichi Ishida, Yasuyuki Okuma, Kazunori Watanabe, Takayasu Sakurai, Makoto Takamiya:
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 2012: 194-195 - 2011
- [j12]Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
0.18-V Input Charge Pump with Forward Body Bias to Startup Boost Converter for Energy Harvesting Applications. IEICE Trans. Electron. 94-C(4): 598-604 (2011) - [j11]Yasuyuki Okuma, Koichi Ishida, Yoshikatsu Ryu, Xin Zhang, Po-Hung Chen, Kazunori Watanabe, Makoto Takamiya, Takayasu Sakurai:
0.5-V Input Digital Low-Dropout Regulator (LDO) with 98.7% Current Efficiency in 65 nm CMOS. IEICE Trans. Electron. 94-C(6): 938-944 (2011) - [j10]Xin Zhang, Yu Pu, Koichi Ishida, Yoshikatsu Ryu, Yasuyuki Okuma, Po-Hung Chen, Takayasu Sakurai, Makoto Takamiya:
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. 94-C(6): 953-959 (2011) - [c21]Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
A 80-mV input, fast startup dual-mode boost converter with charge-pumped pulse generator for energy harvesting. A-SSCC 2011: 33-36 - [c20]Po-Hung Chen, Koichi Ishida, Katsuyuki Ikeuchi, Xin Zhang, Kentaro Honda, Yasuyuki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
A 95mV-startup step-up converter with Vth-tuned oscillator by fixed-charge programming and capacitor pass-on scheme. ISSCC 2011: 216-218 - 2010
- [c17]Po-Hung Chen, Koichi Ishida, Xin Zhang, Yasuaki Okuma, Yoshikatsu Ryu, Makoto Takamiya, Takayasu Sakurai:
0.18-V input charge pump with forward body biasing in startup circuit using 65nm CMOS. CICC 2010: 1-4 - [c15]Yasuyuki Okuma, Koichi Ishida, Yoshikatsu Ryu, Xin Zhang, Po-Hung Chen, Kazunori Watanabe, Makoto Takamiya, Takayasu Sakurai:
0.5-V input digital LDO with 98.7% current efficiency and 2.7-µA quiescent current in 65nm CMOS. CICC 2010: 1-4
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