An audio ADC delta-sigma modulator with 100 dB SINAD and 102 dB DR using a second-order mismatch-shaping DAC

Abstract

A second-order audio ADC /spl Delta//spl Sigma/ modulator using a low-complexity 33-level second-order mismatch-shaping DAC is presented. The DAC encoder is designed to reduce signal-dependent DAC noise modulation. The prototype was implemented in a 3.3 V 0.5 /spl mu/m single-poly CMOS process, and it achieves 100 dB SINAD and 102 dB DR.