ERT中多通道程控增益放大电路设计  

Circuit Design with Multichannel and Programmable Gain Control in ERT

作　　者：李改利[1] 

机构地区：[1]中北大学电子测试技术国家重点实验室,山西太原030051

出　　处：《电子科技》2011年第8期81-84,共4页Electronic Science and Technology

摘　　要：针对ERT(电阻层析成像),并行数据采集中通道数多且采集到的微弱信号变化范围较大的特点,提出了一种新的多通道程控增益放大电路设计方案。方案中通过检测各通道中输入信号的大小,相应地调节各通道输入信号的放大倍数,使其满足模数转换器(ADC)的输入要求,从而进行A/D采样。介绍了基于AD603的程控增益放大电路设计方案,实现方法以及实验结果。研究设计的多通道程控增益放大电路具有一定的通用性。A new design scheme of the circuit with multichannel and programmable gain control is proposed in view of the parallel data acquisition for Electrical Resistance Tomography,which has many channels and the wide range of variation for acquisition small signal.In order to meet the input requirements of Analog to Digital Converter,it is necessary to adaptively change the amplification factors of input signal in every channel by detecting the signal in sizes in the scheme,and sample by Analog to Digital Converter.The paper introduces the design scheme of programmable gain control amplification circuits based on AD603,implementation method and experimental result.The presented multichannel and programmable gain control circuit is universal.

关 键 词：ERT 多通道 程控增益 AD603 

分 类 号：TN721.1[电子电信—电路与系统] TP272[自动化与计算机技术—检测技术与自动化装置]