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为解决氮化镓(GaN)固态功率放大器(Solid-State Power Amplifier, SSPA)线性度较差的问题，采用模拟预失真技术设计了一款新型结构的线性化器，将2支肖特基二极管及其管座电路并联，并通过2路偏置电路分别控制，使用微带隔离器减少二极管间的相互干扰，并对输入输出驻波进行改善。通过电路设计软件ADS进行仿真，仿真结果显示，可以实现幅度补偿2.2～6.1 dB,相位补偿21.5°～49°。根据测试数据建立功率放大器非线性模型，与线性化器进行级联仿真。结果表明，目标GaN SSPA饱和输出功率回退3 dB时，可改善三阶互调10 dB以上。进行实物加工及测试，验证了该线性化器可大幅改善功率放大器的线性度。
Abstract：In order to solve the problem of poor linearity of GaN Solid-State Power Amplifier(SSPA), a novel structure linearizer is designed by using analog predistortion technology. Two Schottky diodes and their socket circuits are connected in parallel and controlled respectively by two bias circuits. A microstrip isolator is used to reduce the mutual interference between the diodes and improve the input and output standing wave. Circuit design software ADS is used for simulation, and the results show that the amplitude compensation range is 2.2～6.1 dB, and the phase compensation range is 21.5°～49°. According to the test data, the nonlinear parameter model of the power amplifier is established and tested in cascade with the linearizer. The results show that the IMD3 can be improved by more than 10 dB when the saturated output power of the target GaN SSPA retreats 3 dB. Finally, the physical processing and testing show that the linearizer can greatly improve the linearity of the power amplifier.
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基本信息:
中图分类号:TN722.75
引用信息:
[1]李东升,李飞锐.一种新型模拟预失真线性化器[J].无线电工程,2023,53(01):148-154.
基金信息:
河北省人才工程培养资助项目(A201901003)~~
2022-12-08
2022-12-08
2022-12-08