小型化星载模拟预失真器的研制

基于肖特基二极管(Schottlky Barrier Diode, SBD)的非线性提出一种新型的小型化、低成本的星载模拟线性化器，可以用来改善卫星测控系统中固态功放在饱和功率输出时引起的非线性失真。首先分析了模拟预失真器的工作原理，给出其等效电路模型，然后采用软件设计和仿真了一个新型的小型化星用模拟预失真器，将设计的电路加工制作并测试。结果表明该线性化器与功放级联后，能够有效改善功放在饱和功率输出时的3阶交调约6dB。

Design of a compact satellite analog predistortion circuit

A compact analog predistortion circuit used to compensate the nonlinear characteristics of solid state power amplifier (SSPA) in the satellite tracking telemetry and command system was developed. This new predistortion circuit is simple, compact and of low cost. The fundamental principle of this linearizer was analyzed and its corresponding equivalent circuit model was shown. Then, the desired non linear characteristics of linearizer versus different circuit parameters were simulated and discussed. Finally, this linearizer was fabricated and measured. The comparative results of both linearized and non linearized amplifiers show that the linearizer can significantly improve the intermodulation distortion of amplifiers by about 6dB.