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供800兆赫小区制移动无线电话用的三种不同频段的放大器模块已经问世。这些模块的典型输出功率为7.5瓦,功率增益25分贝,采用 A-类输入级,能对输出进行自动增益控制,控制范围35分见。这些三级放大器中每一个都做在二片混合电路基片上,采用薄膜连线和金键晶体管。后
Three different frequency band amplifier modules for the 800 MHz cell-phone system have come out. The typical output power of these modules is 7.5 watts and the power gain is 25 dB. The A-class input stage provides automatic gain control of the outputs with a 35-point control range. Each of these three-stage amplifiers is fabricated on a two-piece hybrid circuit substrate using thin-film wiring and gold-key transistors. Rear