A Mixed CT/DT ΣΔ ADC with Capacitor Digital Self-Calibration for RC Spread Compensation

LIU Yan; HUA Si-liang; WANG Dong-hui; HOU Chao-huan

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A Mixed CT/DT ΣΔ ADC with Capacitor Digital Self-Calibration for RC Spread Compensation

更新时间：2025-07-16

- A Mixed CT/DT ΣΔ ADC with Capacitor Digital Self-Calibration for RC Spread Compensation
- Acta Electronica Sinica Vol. 39, Issue 5, Pages: 1185-1189(2011)
- 作者机构：
  
  中国科学院声学研究所,北京,100190
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN43
- Published：2011
- 稿件说明：
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LIU Yan, HUA Si-liang, WANG Dong-hui, et al. A Mixed CT/DT ΣΔ ADC with Capacitor Digital Self-Calibration for RC Spread Compensation[J]. Acta Electronica Sinica, 2011, 39(5): 1185-1189.
DOI：

LIU Yan, HUA Si-liang, WANG Dong-hui, et al. A Mixed CT/DT ΣΔ ADC with Capacitor Digital Self-Calibration for RC Spread Compensation[J]. Acta Electronica Sinica, 2011, 39(5): 1185-1189. DOI：

摘要

本文根据连续时间调制器和离散时间调制器的各自优缺点

提出了一种新型混合调制器结构的音频Sigma Delta模数转换器

电容数字自校准电路用来补偿连续时间积分器的RC常数

斩波稳定技术用来降低深亚微米CMOS工艺下的闪烁噪声.测试结果表明连续/离散混合结构Sigma Delta模数转换器的峰值信噪比达到102dB

芯片总体功耗为30mW.

Abstract

This paper provides a mixed continuous-time/discrete-time sigma delta ADC.This ADC combines the benefits of CT and DT circuits

and the self-calibration control circuits compensate for the variation of the RC product in the continuous-time integrator.Chopper stabilization can remove the flicker noise especially problematic in deep submicron MOS devices.Measurement results show that the peak SNR of this ADC reaches 102dB and the total power consumption is less than 30mW.

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