An 8-Channel Fully Wirelessly Powered and Controlled Chip for Simultaneous ECG, EMG, and EOG Sensing

This paper presents an eight-channel wirelessly powered and configured SoC for diverse biosignal sensing. An inductive 40.68 MHz link transfers power and clock signals to the chip, while data transmission from the chip is achieved using a UWB Tx in combination with an SMDL antenna, enabling communication over a distance of 4.3 m at 433 MHz. The chip consumes 170 uW (at $1 \mathrm{kSa} / \mathrm{s}$, eight channels) which can be scaled down to 70 uW (at $1 \mathrm{kSa} / \mathrm{s}$, single channel) by wirelessly disabling unused channels or lowering the sampling rate. To the author’s knowledge, this work is the first demonstration of simultaneous ECG, EMG, and EOG sensing in a fully wireless format.