摘 要:采用方框图分析法,对电压负反馈放大电路进行了分析。经对闭环和开环状态下的微变等效电路分别列写节点方程,并利用Matlab软件,编写程序,求解电路方程。运行结果表明,开环与闭环增益满足反馈放大器中的基本关系式,同时,引入负反馈后稳定性得以提高,输入、输出电阻减小,与负反馈对放大器性能影响中的基本理论相一致。
关键词:反馈放大器;基本放大器;开环;闭环
Application for Matlab Software in Negative Feedback Amplifier Circuit
YANG Yijun1,WANG Xin2
(1.Huaibei Coal Industry Teacher′s College,Huaibei,235000,China;
2.Department of Industrial Engineering,Zhejiang Sci-Tech University,Hangzhou,310018,China)
Abstract:The paper develops a method of block diagram analysis and gets the node equation result from closed-loop and open-loop-equivalent circuit in the negative voltage feedback amplifier circuit.The results illustrate open-loop and closed-loop gain to meet basic relationship which are applied by Matlab software.Also,the stability of circuit which is consistent with the theoretical results is confirmed while the circuit parameters are changed.
Keywords:feedback amplifier;basic amplifier;open-loop;closed-loop
伴随电子技术和计算机技术的迅速发展,计算机软件应用于电子线路课程教学中,作为提高教学质量,改进教学手段和方法的做法之一收到了较好的效果。然而,有些文献[1-3]在讨论负反馈放大电路的开环放大倍数时,忽略了反馈网络的负载效应,可能会造成一些误会。本文采用方框图分析法,借助于Matlab软件,经计算分析,验证了Af=A/(1+AF)基本关系式,并就稳定性和输入、输出电阻做了讨论,得到与基本理论一致的结论。
相关热词搜索: 负反馈 电路 放大 分析 MATLAB