一种通信应用中的X波段行波管预失真器

Novel Predistortion Linearizer of X-Band Traveling Wave Tube in Communication Applications

随着通信技术的发展,行波管功率放大器预失真电路显得日益重要。不过,目前预失真电路在调节过程中增益和相位扩张量不能独立调节,很难保证增益和相位同时满足线性化指标的要求,给调节工作带来了困难。本文介绍一种预失真线性化器电路,该电路结构简单,在相位扩张量变化较小的同时,可以对增益扩张量进行调节控制。实验表明,在频率为8.38~8.58 GHz和额定输入功率范围内,预失真器增益和相位扩张量分别为6 dB和42°,满足通信工程中对行波管功率放大器补偿的需求。

A novel type of the predistortion linearizer of X-band traveling wave tube amplifier（TWTA） in communication applications was developed.The newly-developed predistortion linearizer with a rather simple circuit is capable of controlling the gain expansion under the condition of small variations in the input power at a given dynamic range,and of producing little phase expansion.Moreover,the gain expansion of the predistortion linearizer was simulated with the Astrophysics Data System（ADS）.The test results show that the predistortion gain and phase expansion were 6 dB and 42 degree,respectively,in a frequency range of 8.38～8.58 GHz,and for the TWTA saturation response in the rating input power.