Experimental implementation of delta sigma AD modulator using dynamic analog components with simplified operation phase

Abstract

A proof-of-concept delta sigma AD modulator using dynamic analog components with simplified operation mode is designed and fabricated in 90 nm CMOS technology. The measurement results of the experimental prototype demonstrate the feasibility of the proposed modulator architecture which can guarantee the reset time for ring-amplifier and relax the speed requirement on the asynchronous SAR quantizer. The peak SNDR of 77.93 dB and SNR of 84.16 dB are achieved while a sinusoid −4 dBFS input is sampled at 14 MS/s with signal bandwidth of 109 kHz. The total analog power consumption of the prototype modulator is 720 µW under the supply voltage of 1.2 V.