一种新型幅相可调预失真器

A New Amplitude-phase Tunable Predistorter

文章提出了一种X波段的幅相可调预失真器．该预失真器基于矢量合成原理，在传统的并联二极管预失真器的基础上改进而来，由两个并联肖特基二极管和一个移相器构成。通过调节移相器的相移量和二极管的偏压，幅相可调预失真器能实现5～10．5dB的幅度扩张和-30-40°的相位变化。这种特性使得该预失真器能可以同时改善固态功率放大器（SSPA）和行波管放大器（TWTA）的非线性失真。

A X band linearizer amplitude -phase tunable improved on the basis of traditional predistorter, and composed predistorter linearizer is proposed in this paper. It is of two traditional parallel Schottky predistorter and a variable phase shifter resistance,which generates the distorted signal. It is adjustable by changing the phase to generates variable distorted signal. Simulation results show that, the linearizer can provide 5 - 10.5dB gain expansion and -30- ＋40°phase change. That means that it can improve the lineafity of solid state power amplifier （SSPA） and traveling wave amplifier （TWTA） at the same time, has wide applicative range