基于二极管Ka波段的新型可调预失真器

为了补偿不同类型功放的非线性特性,设计应用于Ka波段的可调预失真器,该电路基于三支线定向耦合器、肖特基二极管、微带线和负载电阻,产生预失真信号。通过调节肖特基二极管的偏置电压、微带线电长度及负载电阻可以提供不同的幅度和相位组合以满足不同类型的功率放大器线性化要求。仿真及实测结果表明,该预失真器在29~31GHz频段范围内,用于行波管(TWTAs)线性化时可提供约6.5dB的增益扩展和46°的相位扩张;用于固态功率放大器(SSPAs)线性化时可提供约11dB的增益扩展和35°的相位压缩。

Novel diode-based Ka band adjustable predistortion linearizer

In order to compensate for the nonlinear characteristics of different types of power amplifier, a Ka-band adjustable predistortion linearizer is presented. Based on three branches directional coupler, GaAs Schottky diodes, microstrip line and the load resistance, the linearizer can provide different nonlinear signals with changing the voltage bias of the two diodes, electrical length and characteristic impedance of the microstrip line. The simulation and measured results show that linearizer is able to form different kinds of predistortion signals. When the travelling wave tube amplifiers (TWTAs) are used, the linearizer can provide approximate 6.5 dB gain expansion and 46 phase expansion. When the solid state power amplifiers (SSPAs) are used, the linearizer can provide approximate 11 dB gain expansion and 35 phase compression.