JSSC 2021第11期Data ConvertersSAR ADC

An 85 dB DR 4 MHz BW Pipelined Noise-Shaping SAR ADC With 1-2 MASH Structure Sei

提出一种采用1-2 MASH结构的流水线噪声整形SAR ADC，实现高动态范围和宽带宽。

动态范围84.6 dB，带宽4 MHz，功耗3.5 mW，采样率83.3 MS/s

噪声整形SAR ADCMASH结构流水线ADC动态范围能效

▸1-2 MASH结构实现3阶噪声整形

▸共享OTA以提高能效

▸流水线结构放宽SAR量化器设计要求

Abstract

A pipelined noise-shaping successive approximation register (NS-SAR) ADC with 1-2 multistage noise-shaping (MASH) structure is presented. Two-stage pipelined structure consisting of 5 bit NS-SAR and 4 bit NS-SAR quantizers enables 3rd-order noise-shaping. A single operational transconductance ampliﬁer (OTA) is shared by an integrator for noise-shaping and a residue ampliﬁer for pipelining to maximize the power efﬁciency. The measured dynamic range (DR) is 84.6 dB when the sampling rate is 83.3 M