基于方框图分析法的负反馈放大电路性能优化  

Negative feedback amplifier circuit performance optimization based on block diagram analysis

作　　者：方卫强 马俊[1] 陈博行 FANG Weiqiang;MA Jun;CHEN Bohang(School of Computer,Qinghai Normal University,Xining 810008,China;College of Physics and Electronic Information Engineering,Qinghai Normal University,Xining 810008,China)

机构地区：[1]青海师范大学计算机学院,青海西宁810008 [2]青海师范大学物理与电子信息工程学院,青海西宁810008

出　　处：《现代电子技术》2021年第8期35-39,共5页Modern Electronics Technique

基　　金：国家自然科学基金资助项目:三江源地区新型水环境监测系统架构及其信息传输机制研究(61761040)。

摘　　要：针对负反馈放大电路存在的增益不稳定,放大器带宽不均衡的情况,该文利用方框图分析法对负反馈放大电路进行分析优化,围绕开环放大倍数A_(uo)、反馈系数F、衰减系数M、闭环增益A_(uf)之间的关系,提出一种提高负反馈放大电路的增益稳定性及均衡放大器带宽的设计思路。实验结果表明,该设计思路提高了负反馈放大电路的增益稳定性,均衡了放大器带宽,从而达到了提高负反馈放大电路性能的目的。该方法可有效解决计算及工业生产中的重要难题,具有一定的实际应用价值。In allusion to the conditions of gain instability in the negative feedback amplifier circuit and the uneven bandwidth of the amplifier,the negative feedback amplifier circuit is analyzed and optimized by means of the block diagram analysis.An idea to improve the gain stability of the negative feedback amplifier circuit and equalize the amplifier bandwidth is proposed to deal with the relationship among the open⁃loop amplification factor A_(uo),the feedback coefficient F,the attenuation coefficient M,and the closed⁃loop gain A_(uf).The experimental results show that this idea can improve the gain stability of the negative feedback amplifier circuit and equalize the amplifier bandwidth,so as to achieve the purpose of improving the performance of the negative feedback amplifier circuit.This method can effectively solve important problems in calculation and industrial production,and has a certain practical application value.

关 键 词：负反馈放大电路 性能优化 方框图分析 增益稳定 带宽均衡 仿真实验 

分 类 号：TN722-34[电子电信—电路与系统]