A 1.8V 9bit 10MS/s SAR ADC in 0.18µm CMOS for bioimpedance analysis

Abstract

In this work a 9-bits low power 10MS/s asynchronous SAR ADC in 180nm CMOS tecnology is presented. The ADC core occupies an active area of 0.124mm2. The ADC main parameters were extracted from post-layout simulations, which resulted in SNR of 55.29dB and ENOB of 8.59 bit at 1.8Vsupply and a sampling frequency of 10MS/s while consuming 0.692mW. The Figure of Merit (FoM) obtained was 145.93 fJ/conversion-step