摘要
针对目前行波管放大器模拟预失真技术中存在的幅度和相位特性关联性强的问题，提出一种双路矢量合成式预失真器。该预失真器由90。电桥、模拟电调衰减器和反射式二极管预失真电路构成。根据理论分析和ADS软件仿真结果加工了实际电路并进行测试。实测结果表明：在工作频率29～31GHz和额定输入功率区间内，该电路可实现与行波管特性相反的预失真性能；合理调整两支路偏置电压，可实现相位扩张改变30°，而增益扩张变化量小于1dB的性能，有效减小了模拟预失真器幅度和相位特性的关联性。
In view of the strong correlation between amplitude and phase characteristics of Traveling Wave Tube Amplifier （TWTA） analog predistortion technology, a dual-branch vector synthesis predistortion linearizer is proposed, which consists ofbranch line hybrid couplers, an adjustable attenuator and a reflective diode-based predistortion circuit. This linearizer is fabricatedand measured according to the theoretical analysis and simulation results. The measurement results show that the linearizer cancompensate the nonlinearity of the TWTAs. Once the two branches bias voltages are rationalized, the phase expansion can change30 degrees, while the change of the amplitude expansion is less than 1 dB, which effectively reduces the correlation between theamplitude and the phase characteristics of the analog predistortion linearizer.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第12期134-138,共5页
High Power Laser and Particle Beams
基金
国家重大科技专项
关键词
行波管放大器
模拟预失真技术
非线性失真
幅度和相位关联性
双路矢量合成
travelling wave tube amplifier
analog predistortion technology
nonlinear distortion
correlation between amplitude and phase
dual-branch vector synthesis
