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针对雷达发射多波束的需求,研制了一套基于氮化镓高电子迁移率晶体管三代半导体器件的增益可控固态放大器系统。描述了系统中微波放大模块、幅相控制和相位补偿的实现方案,分析了功率放大器栅极电压与放大器增益和输出信号相位的关系。通过幅相控制电路实现发射通道输出信号幅度和相位快速转换,满足发射多波束的需求。经试验验证,研制的大动态范围增益可控固态放大器系统,提高了效率和工作带宽,解决了传统发射多波束系统中的问题。
Aiming at the demand of radar transmitting multi-beam, a gain-controllable solid-state amplifier system based on three generations of semiconductor devices with gallium nitride high electron mobility transistor has been developed. The implementation scheme of microwave amplification module, amplitude and phase control and phase compensation in the system are described. The relationship between the gate voltage of the power amplifier and the gain of the amplifier and the phase of the output signal is analyzed. Through the amplitude and phase control circuit, the output amplitude and phase of the transmission channel can be quickly converted to meet the requirement of transmitting multi-beam. The experimental verification, the development of large dynamic range gain controlled solid state amplifier system to improve the efficiency and bandwidth, to solve the traditional launch of multi-beam system problems.