一种高线性度电荷平衡式 A/D 转换系统实现

A High Linearity Charge balancing A/D Conversion System

本文提出电荷平衡式Ａ／Ｄ转换器通用模型，给出其传输特性及非线性误差表达式，探讨减小非线性误差的技术方法，并设计了一种定压方式的脉宽调制Ａ／Ｄ方案，在仅需最少精密器件且勿需补偿的情况下实现高线性度Ａ／Ｄ转换系统设计，取得了很好的实用效果。

Based on the review of the well known charge balancing A/D conversion techniques,this article proposes the general model for them.The equation about the nonlinearity and critical non ideal factors is formulated with a rigorous and simple mathematical method.Then the paper presents a new technique to minimize the nonlinearity effectively,which require a minimum of precision devices and need not to compensate.Experiments show that the technique is excellent.