Modeling and Optimization of the Charge Sharing Effect of Switched-capacitor S/H Circuit

SUN Zhen-ya; SUI Zhi-ling; CHEN Hua; XU Shuang-heng; ZHU Huan; ZHANG Jun

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Modeling and Optimization of the Charge Sharing Effect of Switched-capacitor S/H Circuit

更新时间：2026-09-04

- Modeling and Optimization of the Charge Sharing Effect of Switched-capacitor S/H Circuit
- Vol. 30, Issue 3, Pages: 16-19(2013)
- 作者机构：
  
  电子科技大学电子薄膜与集成器件国家重点实验室机构,四川,成都,610054
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
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孙振亚, 眭志凌, 陈华, 徐双恒, 朱欢, 张军. 基于预充电和双采样技术的S/H电荷共享消除技术[J]. 微电子学与计算机, 2013, 30(3): 16-19.

SUN Zhen-ya, SUI Zhi-ling, CHEN Hua, et al. Modeling and Optimization of the Charge Sharing Effect of Switched-capacitor S/H Circuit[J]. 2013, 30(3): 16-19.
孙振亚, 眭志凌, 陈华, 徐双恒, 朱欢, 张军. 基于预充电和双采样技术的S/H电荷共享消除技术[J]. 微电子学与计算机, 2013, 30(3): 16-19. DOI：

SUN Zhen-ya, SUI Zhi-ling, CHEN Hua, et al. Modeling and Optimization of the Charge Sharing Effect of Switched-capacitor S/H Circuit[J]. 2013, 30(3): 16-19. DOI：

摘要

针对开关电容采样/保持(S/H)电路中由负载电容记忆效应引起的电荷共享问题进行了建模.电荷共享效应会导致运放建立幅度增加

根据所推导的运放建立总公式

得出建立幅度增加会增大对运放功耗和带宽要求

或者降低建立速度.为改善该现象

基于预充电思想和双采样技术提出了一种优化方案

能在保持原S/H电路速度不变时

消除电荷共享效应对运放功耗和带宽的额外要求.仿真实现的12位100Msps双采样/保持电路证明了其有效性.

Abstract

Charge sharing phenomenon due to load capacitances memory effect in switched-capacitor sample-and-hold(S/H) circuit is modeled

which gives it may cause the opamp settling amplitude increasing.According to the total equation derived from the settling behavior of opamp

the increased amplitude may further cause more power

larger bandwidth or lower speed.For improving this phenomenon

an optimizing methodology is proposed based on pre-discharge theory and double sampling technology

which can eliminate the extra requirement of power and bandwidth without reducing the initial speed of S/H circuit.A 12bit

100Msps double S/H circuit achieved by simulation proves the availability of this method.

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