文氏桥振荡电路仿真分析

The simulation analysis of RC-bridge oscillator

文氏桥振荡电路是电子技术实验中的一个重要实验,在实验中遇到的问题是起振过程不易观察,输出信号幅度大小不易控制。利用Multisim软件通过仿真分析解决这两个问题,给出了文氏桥振荡电路输出幅值的计算式,所得计算结果与仿真值一致,还发现文氏桥振荡电路二极管正向导通电压VD随负反馈电阻的增加而略有增加。

Wien Bridge oscillator is an important experiment of eleetronie teehnology experiment. The problems eneoun- tered in the experimental that the start-up process is difficultly observed and the size of the output signal amplitude is difficultly controlled. In this paper, the above problems are successfully solved by use of Multisim simulation software solutions, and Wien Bridge oscillator output amplitude calculation formula is given. The experimental show that the calculated value is consistent with the simulation results. In addition, it was found that Wien bridge oseillation circuit diode forward voltage VD slightly increases with negative feedbaek resistance.