一、引言固态发射机最突出的特点是可靠性很高,平均无故障间隔时间MTBF很长(一般达10~5～10~6小时)以及重量轻、体积小、效率高等。一部雷达往往需要数量很大的微波功率晶体管及其所组成的功率放大器组件,这些组件在通电运行时,功率密度高、电流大,加上晶体管功率余量小,因而结温很高,极容易在功率放大器甚至发射系统中由于稳定性差引起微波功放管的不应有的烧毁,这是应当加以避免的。否则作为军事应用 I. INTRODUCTION The most prominent feature of solid-state transmitters is their high reliability. The mean time between failure (MTBF) is very long (usually 10 ~ 5 ~ 10 ~ 6 hours), as well as light weight, small size and high efficiency. A radar often requires a large number of microwave power transistors and their power amplifier components, these components in the power running, high power density, current, coupled with the small transistor power margin, so the junction temperature is very high, very It is easy to cause the unwanted burning of the microwave power amplifier tube in the power amplifier or even the transmitting system due to the poor stability, which should be avoided. Otherwise as a military application