微波大功率变脉冲放大器的研制  

A Study and Design of Microwave High Power Amplifier with Variable Pulse Width

作　　者：田超[1] 张健霖 陈卫东[1] 王东进[1] 

机构地区：[1]中国科学技术大学中国科学院电磁空间信息重点实验室,合肥230027

出　　处：《现代雷达》2016年第12期78-82,共5页Modern Radar

基　　金：国家863计划资助课题(2013AA122903)

摘　　要：针对基于悬浮平台微波凝视关联成像系统对变脉冲宽度和大峰值功率的需求,研制了一款X波段变脉冲固态功率放大器。描述该放大器组件中高速漏极调制及保护电路和射频开关的实现方案,分析大功率高速漏极调制电路输出电压脉冲的影响因素,优化调制电路的负载设计,并解决功放输出射频脉冲的包络凹陷问题。经试验验证:研制的功率放大器具有散热性好,稳定工作时间长,最窄脉宽20 ns,上升下降沿均小于3 ns,峰值功率大于40 W的射频脉冲输出等特点;其漏极调制电路输出24 V电压脉冲,上升沿小于20 ns,下降沿约60 ns。With the demand of variable pulse width and high peak power by the microwave staring correlated imaging system of sus-pended platform, an X-band variable pulse width solid-state power amplifier is designed in this paper. The implementation schemes of the high-speed drain modulation, protection circuit and the radio frequency （ RF） switch are described. Then the factors affect-ing the voltage pulse of the high power and high-speed drain modulation circuit are analyzed and the load of the drain modulation circuit is optimized. In addition, solutions are put forward for the problem that the envelope of the output RF pulse of the amplifier sags. Experiments demonstrate that the developed power amplifier can work stably for a long time and the most narrow output pulse width is 20 ns with more than 40 W peak power, and less than 3 ns rising and falling time. The rising time of the 24 V voltage pulse of the drain modulation circuit is less than 20 ns, and the falling edge is about 60 ns.

关 键 词：变脉冲功率放大器 高速漏极调制 射频开关 功率合成 

分 类 号：TN722.75[电子电信—电路与系统]