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OPA847互阻放大器应用

Other Parts Discussed in Thread: OPA847

我目前用的APD的灵敏度为40A/W,入射光功率中直流分量为100uW(转换后为4mA),交流分量为50uW(转换后为2mA)。我现在用电流源和4.7pF电容模拟APD,互阻放大器选用OPA847,发现如果不滤除直流分量的话,我的互阻增益就很小,所以我在进入放大器之前加了LC高通滤波,如下图所示。请问这样会引入过多噪声么?还有别的方法可以消除直流分量吗?