A 14-bit MOS DAC with current sources free from power-line voltage drop and with output circuits free from code-dependent variable time constant. - Toru Sai; Yasuhiro Sugimoto (ECCTD, 2009)

Design of a 1-V operational passive sigma-delta modulator. - Toru Sai; Yasuhiro Sugimoto (ECCTD, 2009)

A Near 1-V Operational, 0.18-µm CMOS Passive Sigma-Delta Modulator with 77 dB of Dyanamic Range. - Toru Sai; Yasuhiro Sugimoto (IEICE Trans. Electron., 2010)

A Current-Mode Buck DC-DC Converter with Frequency Characteristics Independent of Input and Output Voltages Using a Quadratic Compensation Slope. - Toru Sai; Yasuhiro Sugimoto (IEICE Trans. Electron., 2012)

A Precision and High-Speed Behavioral Simulation Method for Transient Response and Frequency Characteristics of Switching Converters. - Toru Sai; Shoko Sugimoto; Yasuhiro Sugimoto (IEICE Trans. Electron., 2012)

A fast and precise circuit simulation method for switching power converters using a mixture of circuits and behavioral models. - Kei Watanabe; Mikio Abe; Toru Sai; Yasuhiro Sugimoto (APCCAS, 2014)

Distributed MPPT PV system with current source inverter. - Toru Sai; Akira Kitamura; Byung-Gyu Yu; Xiang-Dong Sun; Mikihiko Matsui (IECON, 2015)

Feedback Loop Analysis and Optimized Compensation Slope of the Current-Mode Buck DC-DC Converter in DCM. - Yasuhiro Sugimoto; Toru Sai; Kei Watanabe; Mikio Abe (IEEE Trans. Circuits Syst. I Regul. Pap., 2015)

Modeling of 3-level buck converters in discontinuous conduction mode for stand-by mode power supply. - Yoshitaka Yamauchi; Toru Sai; Takayasu Sakurai; Makoto Takamiya (ISCAS, 2017)

Luciola: A Millimeter-Scale Light-Emitting Particle Moving in Mid-Air Based On Acoustic Levitation and Wireless Powering. - Yuki Uno; Hao Qiu; Toru Sai; Shunta Iguchi; Yota Mizutani; Takayuki Hoshi; Yoshihiro Kawahara; Yasuaki Kakehi; Makoto Takamiya (Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., 2017)

Luciola: a light-emitting particle moving in mid-air based on ultrasonic levitation and wireless powering. - Hao Qiu; Yuki Uno; Toru Sai; Shunta Iguchi; Yota Mizutani; Takayuki Hoshi; Yoshihiro Kawahara; Yasuaki Kakehi; Makoto Takamiya (SIGGRAPH ASIA Emerging Technologies, 2018)

2/3 and 1/2 Reconfigurable Switched Capacitor DC-DC Converter With 92.9% Efficiency at 62 mW/mm2 Using Driver Amplitude Doubler. - Toru Sai; Yoshitaka Yamauchi; Hajime Kando; Tatsuya Funaki; Takayasu Sakurai; Makoto Takamiya (IEEE Trans. Circuits Syst. II Express Briefs, 2018)

Digital Active Gate Drive with Optimal Switching Patterns to Adapt to Sinusoidal Output Current in a Full Bridge Inverter Circuit. - Yu-Shan Cheng; Daiki Yamaguchi; Tomoyuki Mannen; Keiji Wada; Toru Sai; Koutaro Miyazaki; Makoto Takamiya; Takayasu Sakurai (IECON, 2019)

A 6.78 MHz Wireless Power Transfer System Enabling Perpendicular Wireless Powering with Efficiency Increase from 0.02% to 48.2% by Adaptive Magnetic Field Adder IC Integrating Shared Coupling Coefficient Sensor. - Hao Qiu; Toru Sai; Makoto Takamiya (VLSI Circuits, 2020)

New high step-up DC-DC converter with quasi Z-source network. - Toru Sai; Younghyun Moon; Yasuhiro Sugimoto (IEICE Electron. Express, 2022)

Improved Quasi-Z-Source High Step-Up DC-DC Converter Based on Voltage-Doubler Topology. - Toru Sai; Younghyun Moon; Yasuhiro Sugimoto (Sensors, 2022)

High-Speed Searching of Optimum Switching Pattern for Digital Active Gate Drive to Adapt to Various Load Conditions. - Yu-Shan Cheng; Daiki Yamaguchi; Tomoyuki Mannen; Keiji Wada; Toru Sai; Koutaro Miyazaki; Makoto Takamiya; Takayasu Sakurai (IEEE Trans. Ind. Electron., 2022)

Cascaded hybrid fibonacci DC-DC converter with interleaved clock for DC grid. - Toru Sai; Yuhao Liu; Yasuhiro Sugimoto (IEICE Electron. Express, 2024)

A large voltage gain and high output power boost converter for PV sources directly convertible to 400V DC microgrid. - Toru Sai; Yasuhiro Sugimoto (IEICE Electron. Express, 2024)