负反馈放大电路稳定性的仿真分析与研究  

The Simulation Analysis and Investigation of Negative Feedback Amplifier's Stability

作　　者：杨一军[1] 陈得宝[1] 邹锋[1] 王孟杰[1] 方振国[1] 李峥[1] 

机构地区：[1]淮北师范大学物理与电子信息学院,安徽淮北235000

出　　处：《合肥师范学院学报》2011年第6期35-37,共3页Journal of Hefei Normal University

基　　金：安徽省教育厅重点资助项目(20100508);淮北师范大学资助项目(jy10233)

摘　　要：对两级电压串联负反馈放大电路的相对稳定性,分别采用了微分形式、差分形式,以及所推导的适用于反馈系数变化条件下的普遍公式进行了分析。结果表明:基本放大器增益变化ΔA不大时,微分形式与差分形式计算结果基本一致;反馈系数改变时,仅有所推公式成立;若ΔA也较大,三种计算结果可以相差很大。另外即使ΔA=0,由反馈系数的变化也能形成较大反馈放大器增益的相对变化。The relative stability of negative feedback circuit with two-staged voltage series is analyzed with differential, deviation and general formulation under the condition that the feedback coefficient is chan- ging. The results indicated that solutions for types of differential and deviation are almost identical with little change of A gain, only the deduced formulation is confirmed when the feedback coefficient is changed and the three formulations are in large difference when A gain is large simultaneously. In addition, the change of feedback coefficient can form the relative change of feedback amplifier with large gain.

关 键 词：负反馈 反馈系数 稳定性 

分 类 号：TM13[电气工程—电工理论与新技术] TM391.9