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我RF RG用470欧姆，想实现最大增益6dB，可是发现控制Vg电压在0到2V时，Vg电压越高增益越小到Vg=0V时增益最大，但也只能实现输入500mv输出300mv，没有达到预期增益
根据手册, 增益是通过电阻这样控制的
而从框图看, 这个 VG 好象是偏置而不是增益调节
