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为了研究小型可靠无线电转发器,设计一种混合集成70兆赫频段主中频放大器,并对集成的一些问题进行了研究。比如,对电路元件的传输特性和寄生电容之间的关系、集成电路的组成、电路元件的传输特性和耦合之间的关系、宽带变压器以及晶体管的热耗散等等,均在实验上和理论上进行了研究。集成70兆赫频段主中频放大器的电性能可以满足所要求的性能,其中心频率为70兆赫、带宽为20兆赫、振幅偏移小于0.2分贝/20兆赫、尺寸为普通独立放大器的五分之一。
In order to study small reliable radio transponders, a hybrid integrated 70 MHz main IF amplifier was designed and some of the problems of integration were investigated. For example, the relationship between the transmission characteristics of the circuit elements and the parasitic capacitance, the composition of integrated circuits, the relationship between the transmission characteristics of the circuit elements and the coupling, the heat dissipation of the broadband transformers and transistors, etc., both in experimental and theoretical On the study. The integrated 70 MHz main IF amplifier meets the required performance with a center frequency of 70 MHz, a bandwidth of 20 MHz, an amplitude offset of less than 0.2 dB / 20 MHz and a size one-fifth that of a typical stand-alone amplifier.