前馈放大器抑制环路的理论分析

为了便于分析前馈放大器对非线性产物的抑制特性,通过抑制环路模型,建立了环路抑制方程,并由计算机仿真得到了环路对非线性产物的抑制性能与幅度失配、相位失配及延迟失配的理论数值关系.分析对比说明,延迟失配是影响环路抑制带宽的主要因素,对前馈放大器电路的设计和调试具有指导意义.

Analysis of the Suppression Loop of a Feedforward Amplifier

In order to analyse the performance of suppression nonlinear productions of feedforward amplifiers, the suppression equation of the loop has been established based on the model of a suppression loop. And the function relation between the performance of suppression nonlinear productions and the mismatching of amplitude, phase and delay of the loop has been developed. Simulation and analyzing results show that the delay mismatching is the dominant factor to affect the bandwidth of a feedforward amplifier. The resuts are significant for the design and debugment of the feedforward amplifiers.