keikawa Goto Github PK

I am Keisuke Kawahara, a Ph.D. student at Yokohama National University, Japan. My interests include integrated circuit design, silicon photonics, optical communication, microwave theory, and signal processing.

• April 2016 – March 2020: Bachelor of Electrical Engineering, Tokyo University of Science, Noda, Chiba, Japan
• April 2020 – March 2022: Master of Electrical Engineering, Tokyo University of Science, Noda, Chiba, Japan
• April 2022 – present: Ph.D. in Progress, Yokohama National University, Yokohama, Kanagawa, Japan

The photonic crystal slow-light modulator delivers high speed and low power dissipation by optimizing electro-optic phase matching and electrical impedance. (📑Optica) (📑OFC)

The image-rejection analog multiplexer increases signal bandwidth threefold by combining digital signal processing with analog multiplication. (📑IEEE T-MTT) (📑IEEE RWS)

The active balun converts single-ended signals to differential signals while maintaining a compact design and minimal imbalance. (📑IEEE TCAS-I) (📑IEEE MWSCAS)

Coupled inductors reduce the area of the differential distributed amplifier by half and enable the amplification of differential signals at frequencies up to several tens of GHz. (📑IEICE TREL) (📑IEEE ISCAS)

The trimless temperature sensor is based on an open-source design rule and is freely reusable. (GitHub Repository)

The class-AB CMOS operational amplifier consumes only 7.7 µA and has a slew rate of 1 V/µs with a 1-nF load. (Slides for 2021 and 2020)