一种数控高增益测量放大器的设计  

Design of High Gain Instrumentation Amplifier by Digital Control

作　　者：戴杰[1] 宾浩[1] 庄知龙[1] 石晨曦[1] 

机构地区：[1]江南大学通信与控制工程学院,江苏无锡214122

出　　处：《现代电子技术》2009年第1期110-111,119,共3页Modern Electronics Technique

摘　　要：根据工程应用中对小信号放大的需要，结合模拟电子技术和单片机技术，设计实现了一种数控高增益测量放大器。根据预置的电压放大倍数合理分配第一级、第二级的放大量，实现了步进为1的1～1000的放大倍数预置和显示功能，同时实现输出共模电压反馈至电源公共端，使运放电源电压随共模输入电压浮动等改进措施提高了放大器的共模抑制比，实现了一种方便实用的数控高增益测量放大器。Based on the needs of amplifying low signal during engineering applications, using analog electronic technology and single chip computer technology, this essay introduces a high gain instrumentation amplifier by digital control. On the basis of preset amplifierts gain,distributes the first and second gains rationally, then realizes the gain from 1 - 1 000 in step 1 and displays the gains. At the same time improves the amplifier＇s common - mode rejection ratio with several amelioration methods. Finally,a convenient and applied instrumentation amplifier by digital control with high gain is finished.

关 键 词：测量放大器 共模抑制比 数字控制 单片机 数模转换器 

分 类 号：TN72[电子电信—电路与系统]