可控增益射频放大器设计报告

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1、摘要系统采用四级放大，电源选用LM1875将单电源转换为双电源，选用LM317、LM337和四输出变压器组成两组直流可调稳压电源，用作正负电源，选用LMH6552芯片搭建全差分放大电路，选用宽频带压控增益放大器VCA821控制增益。放大器输入5mV,100MHz时，输出电压有效值为2.9V大于2V，增益大于52dB；50MHz-160MHz频率范围内增益波动都在2dB内；通频带在60MHz-200MHz内。完成了所有基本部分的要求和部分发挥部分的要求。关键词：射频放大器、VCA821、可控增益、VGA一、系统方案论证与选择....................

2、.............................................................................................11.1系统电源转换选择.............................................................................................................11.2系统电源稳压方案..........................................................

3、...................................................21.3高频放大器的选择.............................................................................................................21.4MCU的选择......................................................................................................

4、....................2二、理论分析与参数计算.................................................................................................................32.1射频放大器设计.................................................................................................................32.2频带内增益起伏控制..

5、.......................................................................................................32.3射频放大器稳定性.............................................................................................................32.4增益调整....................................................

6、.........................................................................3三、电路与程序设计.......................................................................................................................43.1电路设计..........................................................................

7、...................................................43.11电源模块....................................................................................................................43.12放大模块...................................................................................................

8、............