双ADC线性拟合的高精度模数转换技术  

Dual ADC High-precision AD Conversion Based on Linear Fitting

作　　者：侯兴哲[1] 陈文斌[2] 李胜芳[1] 付志红[2] 

机构地区：[1]国家电网公司电能计量器具性能评估实验室,重庆401123 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《微计算机信息》2010年第32期162-164,共3页Control & Automation

基　　金：项目名称:重庆大学"211工程"三期创新人才培养计划建设项目(S-09111);输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512709209)

摘　　要：模数转换器(ADC)的高速转换和高精度是难以兼顾的矛盾,利用两次采样模数转换原理,本文提出一种双ADC线性拟合的高精度模数转换技术。该技术由两个模数转换器、一个数模转换器以及外部辅助电路组成,通过实物仿真计算出权系数,对两个模数转换器的转换值进行线性拟合,得到高精度转换值。基于VHS-ADC高速数字信号处理系统搭建模型,与外部辅助电路联合进行仿真实验,实验表明,该技术可提高ADC的转换精度,并保持较高采样率。Conflict between high converting precision of ADC is a difficult problem to solve.With twice sample AD conversion theory,The paper presents a dual ADC high-precision AD conversion based on linear fitting.The technology consists of two analog-digital converters,one digital-analog converter and an external assistant circuit.Calculate the weight coefficient by simulation,and then convert the two conversion values to a new high-precision result based on linear fitting.Based on a model built on VHS-ADC,a highspeed signal processing system,A simulation test is running,associated with an external assistant circuit.This experiment has proved that it can improve the ADC＇s precision by the technology,and keep its high speed sampling rate.

关 键 词：线性拟合 VHS-ADC 双ADC 模数转换 

分 类 号：TP335[自动化与计算机技术—计算机系统结构]