自激振荡虚拟实验电路设计及其仿真

Design and Simulation of Virtual Self-oscillating Circuits

本文给出了演示自激振荡现象的负反馈放大电路,该电路仅由运放和RC元件构成,既便于进行理论推导、分析,也便于进行仿真演示,非常适合于教学之用。根据自激振荡的起振条件,给出了反馈网络电阻参数应满足的关系。利用电路仿真软件Multisim对电路的特性进行了分析。仿真结果验证了理论分析结果。本文的讨论可供讲授电路理论或模拟电子技术课程的教师参考。

This paper presents a simple negative feedback amplifier circuit for demonstrating self-oscillation. The circuit consists only of the op amps and RC elements and can be used for both theoretical derivation and experimen- tal simulation. It is very suitable for teaching purposes. The relationship between resistors of the feedback network is given according to the self-oscillation start-up condition. The characteristics of the circuit are also analyzed using circuit simulation software Multisim. Simulation verifies the theoretical analysis results. The discussion is helpful for the teaching of Circuits and Analog Electronic Technology courses.