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I want to design a low-noise photoelectric detector. As the circuit shown, The light is detected by the photodiode first, and then the photo current is divided to DC and AC signals by the inductors (L1-4) and a capacitor (C3) for handling separately. The AC current signal flows through the inverting input terminal and is amplified by the OPA847 to measure the noise power of the injected light. The DC signal is amplified by OP27 to measure the energy level of light.try.TSC
this is a commonly used trick. It turns a circuit consisting of ideal parts into a more real circuit with parts having ohmic losses and leakage currents. This can help to make the math of simulation properly run.
