用于行波管放大器的预失真线性化技术研究  

Development of Predistorter for Compensating Nonlinearity of Traveling Wave Tube Amplifiers

作　　者：宋家乾[1] 周东方[1] 张翔[1] 

机构地区：[1]解放军信息工程大学,郑州450002

出　　处：《真空科学与技术学报》2008年第5期471-475,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：本文第一部分介绍了行波管的非线性特性,给出了Saleh提出的行波管非线性模型,用其对某行波管的实测数据拟合,拟合均方误差小,结果好。第二部分首先介绍了预失真技术的原理与基本方法,在Saleh模型的基础上,通过级联网络的理论,得出与行波管配用预失真线性化器的幅度和相位预失真函数。第三部分利用二极管的变阻特性,提出了一种利用肖特基二极管构成的预失真电路。通过计算该电路交流通路的等效二端口网络散射参数S21的幅度和相位,得出其随输入功率的变化趋势与行波管配用预失真线性化器的幅度和相位预失真函数变化趋势相同。调节二极管的直流偏压及电阻,即可与实际行波管配用。最后通过ADS软件对电路进行仿真,得出其增益和相移特性与理论分析的结果一致。A novel type of pre-distorter has been successfully developed to compensate the nonlinear distortions of the traveling wave tube amplifiers （TWTA）, in which a Schottky diode circuit is used. The pre-distorter can well match any TWTA just by adjusting the DC bias and resistance of the diode circuit. Discussions centered on nonlinearity of the TWTA, operating principles of pre-distortion technologies available and derivation of the power and phase pre-distortion functions by means of Saleh model. The pre-distortion circuit was simulated with the ADS software package;and the simulated gains and phase shifts agree well with those of the theoretical calculations.

关 键 词：真空管 非线性失真 预失真 二极管 

分 类 号：TN722[电子电信—电路与系统]