选择OPA380对光电PIN管进行前置信号放大。PIN管输出直流分量200uA-500uA,交流10uA(1-10MHz)。电路采用带偏置的反向放大电路,其中偏置电压可以减小PIN管的电容以提高响应速度,Vs=5V,Vbias=2.5V。在这种情况下,由于担心直流饱和,希望只放大交流成分,电路应该如何设计?如果直接在PIN管输出后面加隔直电容,那么PIN的反偏电压就没有了。求指点,多谢。
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