一、引言 GaAs微波场效应晶体管是通信卫星转发器中的关键器件,除了电性能指标要求高以外,还要求高可靠、长寿命。目前,国际上大型通信卫星都装有十几个C波段和Ku波段转发器,要求在轨寿命为十五年。若采用常规的可靠性定级试验方法,需要投入大量的器件和很长的试验周期。例如,对CX562器件过去进行过六级失效率定级试验,投入458只器件,试验2000h,连续工作了三个月以零失效通过,当时样品费和试验费需要几十万元,费用极其昂费。国外对于通信卫星用的GaAs微波场效应管从 I. INTRODUCTION GaAs microwave field-effect transistor is a key component in communications satellite transponder. In addition to the high electrical performance requirements, it also requires high reliability and long life. At present, large international communications satellites are equipped with more than a dozen C-band and Ku-band transponders, requiring on-orbit life of 15 years. Adopting the conventional reliability rating test method requires a large amount of devices and a long test period. For example, CX562 devices in the past conducted six grading failure rate test, invested 458 devices, test 2000h, continuous work for three months to zero failure, then the sample cost and test costs need hundreds of thousands of dollars, the cost is extremely expensive fee. GaAs microwave FET for communications satellites abroad