一种改进的线性功放前馈设计法

A Method on Improved Design of Feedforward Power Amplifier

根据表示功率放大器线性的参数——三阶互调的产生机理,提高功率放大器线性的方法有功率回退法、预失真法和前馈法。传统的前馈技术存在成本过高、功率损耗过大的问题,通过改变系统组成、增加环行器的方式可以改进传统前馈技术,通过实验对比,表明该方法能明显改善传统前馈技术中存在的问题。

According to the producing mechanism of the Third-order interception which shows the linearization of power amplifier,the methods of improving the linearization of power amplifier include power-back,predistortion and feedforward.The traditional feed-ford technique has two problems,which are high cost and excessive power loss.This paper introduces a method which can improve the design of feedford power amplifier by changing the system composition and the Central Bank.And the experiments have proved that the method can obviously solve many problems existed in the traditional method.