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1.引言近年来,由于微波双极晶体管和微波场效应晶体管在制造工艺上所取得的成就,使得使用电真空器件的一些无线电设备单元完全可以用半导体器件代替。用线性放大器作为无线电发射设备的输入,输出极和中放、以及作为无线电测量仪器的某些单元是
1. Introduction In recent years, due to the achievements made in manufacturing processes of microwave bipolar transistors and microwave field-effect transistors, some radio equipment units using electric vacuum devices can be completely replaced by semiconductor devices. Linear amplifiers are used as the input, output and drop of radio transmitting equipment, and some units as radio measuring instruments are