I am Keisuke Kawahara, an Assistant Professor at Institute of Science Tokyo (formerly Tokyo Institute of Technology), Japan. My interests include high-speed electornic and photonic integrated circuit design.

Achieving record low power consumption by optimizing the electrode impedance of a photonic crystal slow-light optical modulator. 📄Optica (Open Access) 📄OFC

World's first demonstration of bandwidth tripling of digital-to-analog converters using an analog multiplexer. 📄IEEE T-MTT 📄IEEE RWS

Imbalance correction and bandwidth extension are simultaneously achieved by an active feedback technique. 📄IEEE TCAS-I 📄IEEE MWSCAS

Coupled inductors halve the chip footprint of a differential distributed amplifier. 📄IEICE TREL (Open Access) 📄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 provides a slew rate of 1 V/µs with a 1-nF load. Slides for 2021 and 2020