华东师范大学学报（自然科学版）Issue(2)：117-127,11.DOI:10.3969/j.issn.1000-5641.2026.02.011
一种面向音频应用的高精度三阶噪声整形SAR ADC设计
Design of a high-precision third-order NS SAR ADC for audio applications
摘要
Abstract
This paper proposes the design of a high-precision third-order noise-shaping(NS)successive approximation register(SAR)analog-to-digital converter(ADC)for audio applications.The NS effect of passive NS circuits deteriorates owing to gain loss.In response,a cascaded integral feed-forward(CIFF)active NS loop is designed.To mitigate the impact of integrator nonlinearity on the ADC,a primary-auxiliary dual-path high-linearity source follower structure is proposed.This source follower buffers the residual voltage onto the integration capacitor,ultimately achieving third-order NS performance.A mismatch error shaping(MES)technique is incorporated to mitigate nonlinearities induced by digital-to-analog converter(DAC)mismatches.Fabricated in a 55 nm CMOS process,the ADC core occupies approximately 0.25 mm2.Post-layout simulation results demonstrate that under a 1.8 V supply voltage at 40℃,while operating at a sampling frequency of 8 MS/s with a bandwidth of 125 kHz and consuming 10.83 mW of power,the ADC achieves an effective number of bits(ENOB)of 15.14 and a signal-to-noise and distortion ratio(SNDR)of 92.92 dB with a Schreier figure of merit(FoMS)of 163.54 dB.关键词
噪声整形SAR ADC/源跟随器/电容堆叠/ping-pong结构/失配误差整形Key words
NS SAR ADC/source follower/capacitor stacking/ping-pong architecture/MES分类
信息技术与安全科学引用本文复制引用
耿楠楠,王济坤,韩守祥,石春琦..一种面向音频应用的高精度三阶噪声整形SAR ADC设计[J].华东师范大学学报（自然科学版）,2026,(2):117-127,11.基金项目
上海市科委资助项目(22DZ2229004) （22DZ2229004）
