一、引言六十年代以来,由于半导体材料和器件制造工艺的发展,晶体管性能日益提高,由高频进入了微波频段;同时,也由于微波集成电路的出现,最近几年晶体管放大器在小型化和高频化方面有了很大的发展。目前,在微波频段的低噪声晶体管放大器,在主要资本主义国家的市场上有了大量的出售,性能达到相当高的水平,广泛地应用在各个领域。较早的晶体管放大器受器件高频性能的限制,只能作低频放大,用晶体管作微波放 I. INTRODUCTION Since the 1960s, due to the development of manufacturing process of semiconductor materials and devices, the performance of transistors has been increasing day by day and has entered the microwave band from high frequencies. At the same time, due to the appearance of microwave integrated circuits, in recent years, There has been a great development in high frequency. At present, the low-noise transistor amplifier in the microwave band has been sold in large quantities in the markets of the major capitalist countries and the performance has reached a quite high level and has been widely used in various fields. The earlier transistor amplifier by the high-frequency performance of the device limited only for low-frequency amplification, transistors for microwave release