文氏桥振荡电路行为仿真及实验分析  

Simulation of behavior of Wien bridge oscillating circuit and experimental analysis

作　　者：刘恒[1] 张易晨 孙晋 刘建成[1] Liu Heng,Zhang Yichen,Sun Jin,Liu Jiancheng(College of Electronics and Information Engineering,Nanjing University of Information Science and Technology, Nanjing 210044, Chin)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《实验技术与管理》2018年第6期122-125,共4页Experimental Technology and Management

基　　金：江苏高校品牌专业建设工程资助项目(PPZY2015B134);教育部产学合作协同育人项目(201701056050;201702109020;201702018120);南京信息工程大学教学改革研究课题(2015年);南京信息工程大学开放实验室项目(2016年)资助

摘　　要：在建立文氏桥振荡电路理论分析模型的基础上,推导了该电路振动幅度的表达式并进行了仿真和实验。实验表明:在满足起振条件后,幅度反馈电阻比值增大,振荡频率呈非线性减小;输出将由正弦波逐渐变为方波;运算放大器的两个输入端的电势差从0逐步非线性增大;运算放大器也由线性模式过渡到非线性模式。文氏桥振荡电路输出不一定是正弦波,需结合具体电路参数确定波形。On the basis of establishing the theoretical analysis model,the expression of vibration amplitude is deduced,and the simulation experiment is carried out.The experimental results show that after the starting conditions are satisfied,the amplitude feedback resistance ratio increases,the oscillating frequency becomes nonlinear,the output gradually changes from the sine wave to square wave,the potential difference of the two input terminals of the operational amplifier increases gradually from 0 to nonlinearity and the operational amplifier also changes from the linear mode to the nonlinear mode.The output of the Wien bridge oscillating circuit is not necessarily the sine wave,and the wave form is determined by combining the specific circuit parameters.

关 键 词：文氏桥振荡器 闭环 仿真实验 

分 类 号：TN911.71[电子电信—通信与信息系统]