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运算放大器的探测极限

用运放搭建一个基本的跨阻放大器,用于光电二极管光电流的检测,请问,只利用常规方法,这个电路可否检测到小于运放输入偏置电流以下的光电流,另外如果输入光电流乘以跨阻小于运放的失调电压,该光电信号是否可以被探测到?另外一个精密运放,其检测的电压下限和电流下限由什么决定?