Ku波段星载行波管混合型预失真线性化器的研究  

Design of Ku-band predistortion linearizer using mixed structure circuit for satellite TWTA

作　　者：张翔[1] 周东方[1] 张毅[1] 孙昱[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002

出　　处：《电子技术应用》2009年第6期128-131,135,共5页Application of Electronic Technique

摘　　要：提出了一种改善行波管放大器非线性特性的预失真新方法,采用载波复幂级数法分析了星载行波管的非线性传输特性,提出一种反向复幂级数的预失真线性技术。所提出的预失真器非线性特性由混合型结构实现,包括肖特基二级管、砷化镓场效应管,改善了行波管在Ku波段的幅度-幅度失真特性,线性增益最大增加30dB,对行波管线性化器的后续研究有一定参考和实用价值。In this paper, a new predistortion method to improve nonlinearity of a traveling wave tube amplifiers （TWTA） is proposed. Nonlinear transfer characteristics of TWTA are analyzed using the carrier complex power series（CCPS） method. An inverse complex power series of a predistortion linearizer to linearize TWTA is also proposed. The nonlinear distortion characteristics of pre- distorter can be realized with the mixed structure that is composed of Schottky diode and GaAs FET. The AM-to-AM characteris- tic of TWTA on Ku-band is improved with maximal linear gain of 30 dB by proposed predistortion linearizer.The results provide reference and practical value to a certainty for the design of linearization used on TWTA.

关 键 词：行波管放大器 复载波幂级数法 线性化技术 预失真 肖特基二极管 砷化镓场效应管 非线性特性 

分 类 号：TN6[电子电信—电路与系统]