A high input impendence AC-coupled SoC suitable for wearable ExG monitor

A high input impendence AC-coupled SoC suitable for wearable ExG monitor is present in this paper. Implemented in the TSMC 0.18μm 1P6M CMOS technology, post-simulation results show that the SoC achieves rail to rail DC differential electrode offset (DEO) rejection, >115 dB of CMRR (@50Hz), >1.5 GΩ of input impendence and 2.99 μVrms of input referred noise. And its gain and bandwidth can be configured separately from 46 dB to 70 dB and from 155 Hz to 1.1 kHz for the low-pass cutoff frequency (LPF) with the high-pass cutoff frequency (HPF) <;0.5 Hz. Under an 8KS/s sample rate, the analog ExG signals can be converted to digital by an SAR ADC with an ENOB of 9.8 bit.