摘要
光电耦合器在隔离模拟信号时,普遍问题是频率响应,输入范围,本底噪声,线性度等特性不能好的协调;通过对问题的分析研究,采用模块化组合的设计思想,利用高速光耦6N136,差分放大器THS4151和仪表放大器INA103,设计了一种新的可以实现模拟信号高速准确隔离传输的电路;详细描述了设计的原理和结构;实验结果表明,电路的-3dB带宽可达1MHz,可输入范围为-5V^+5V,线性度误差小于1%,本底噪声峰峰值小于20mV。
When isolating the analog signal with the optical coupler, the common problem is that frequency response, input amplitude scope, background noise and linearity can' t coordinate well. Through analysis and study on the problem, using modularization combination design, the paper develops a new circuit realizing analog signal high--speed isolation with the high--speed optical coupler 6N136, full differential amplifier THS4151 and instrumental amplifier INA103. The paper emphasizes designing principle and construction. The experiment result demonstrates the circuit works well with --3dB frequency width of 1MHz, input amplitude scope from --5V to 5V, linearity error less than 1%, and peak-- peak amplitude of background noise less than 20mV.
出处
《计算机测量与控制》
CSCD
北大核心
2010年第6期1361-1363,共3页
Computer Measurement &Control
基金
国家自然科学基金项目(10835009)
科学院知识创新工程重要方向性项目(KJCX3.SYW.N4)
关键词
光电耦合器
模拟信号
高速隔离
线性度
本底噪声
optical coupler
analog signal
high-- speed isolation
linearity
background noise