ICCCAS Invited Speaker

Satoshi Komatsu

Tokyo Denki University, Japan

Biography: Satoshi Komatsu received the B.S., M.S., and Ph.D. in Electronic Engineering from the University of Tokyo, Tokyo, Japan, in 1996, 1998 and 2001, respectively. He was an assistant professor and an associate professor in VLSI Design and Education Center (VDEC), The University of Tokyo. In 2014, he joined Tokyo Denki University and he is currently a professor at the university. His current research interests are testing of VLSI systems and system level VLSI design methodologies.
He is a member of Institute of Electrical and Electronics Engineers (IEEE), Institute of Electronics, Information and Communication Engineers of Japan (IEICE), and Information Processing Society of Japan (IPSJ).
Speech Title: Low-Voltage Delta-Sigma Modulator with Bulk Input OTA for Volume Pulse Wave Measurements
Abstract: Wearable devices worn on the body to monitor biological signals are usually powered by batteries. The DS modulator (DSM) used in these devices must have low power consumption to extend the battery runtime of the devices. In addition, since biological signals are low frequency signals, the Gm-C integrator in the modulator requires a low transconductance (low-Gm) OTA. Though a low supply voltage effectively reduces the modulator’s power consumption, it leads to a narrow input voltage range of OTA. In this study, we propose a low-Gm OTA with an improved input voltage range under low power supply by bulk input. We also propose a low-voltage DSM by using the proposed OTA. We designed the DSM in a 180 nm CMOS process, 0.6 V supply voltage, 200 Hz bandwidth, and 51.2 kHz sampling frequency. The circuit simulation results show the DSM achieves a power consumption of 523 nW and a peak SNDR of 77.3 dB. In addition, we show volume pulse wave measurement results using the proposed DSM to evaluate its application to biomedical signal measurements.