K频段自适应前馈行波管放大器设计  

Design of K Band Adaptive Feedforward TWT Amplifier

作　　者：黄微波 杨飞 王勇 方龑 雷劼 HUANG Wei-bo;YANG Fei;WANG Yong;FANG Yan;LEI Jie(China Academy of Space Technology(Xi'an),Xi'an 710100,China)

机构地区：[1]空间技术研究院西安分院,西安710100

出　　处：《微波学报》2022年第1期71-75,共5页Journal of Microwaves

基　　金：“十四五”国家科技重大专项(2009ZYHD0003)。

摘　　要：空间通信系统高保真转发对大功率行波管放大器的线性化度提出了更高的要求。针对高频段和大功率应用,基于预失真和前馈线性化技术,设计了一种K频段50 W自适应前馈线性化行波管放大器,介绍了其基本原理和参数,研究了前馈双检波电路结构及并行变步长的组合自适应控制算法。在K频段400 MHz带宽内,实现了输入功率20 dB大动态调整情况下失真信号自适应对消抑制,在相对于单载波饱和输出功率回退3 dB点,三阶交调小于-35 dBc,验证了前馈线性化技术在线性度改善方面的巨大优势。High fidelity transponder in space communication system requires higher linearity of high power TWT amplifier. Based on pre-distortion and feedforward linearization technology, a K band 50 W adaptive feedforward linearized TWT amplifier is designed for high frequency and high power applications. Its basic principle and parameters are introduced, and the parallel variable step-size combined adaptive algorithm is proposed. The distortion signal is adaptive cancelled under the condition of 20 dB of dynamic input power adjustment within 400 MHz bandwidth of K band. The third-order intermodulation is less than-35 dBc at the saturation output power back off 3 dB, which verified the great advantages of feedforward linearization technology in improving linearity.

关 键 词：前馈 预失真 行波管 线性化 放大器 三阶交调 

分 类 号：TN722[电子电信—电路与系统]