Patent ID: 7183859

Claim:
A circuit for connecting to a power supply having power supply noise, the circuit for amplifying an input signal from a photodetector comprising: a transimpedance amplifier (TIA) circuit for operating in a differential manner and having a gain and a first input port for receiving the input signal from the photodetector, a second input port and an output port, the TIA circuit for providing a TIA circuit output signal comprising a voltage ripple signal dependent on the power supply noise and an amplified signal dependent on the input signal and the gain of the TIA circuit; a first biasing circuit coupled to the second input port for providing a first bias signal thereto, the first bias signal including the voltage ripple signal dependent on the power supply noise; and, a filter circuit coupled to the output port of the TIA circuit for filtering the TIA circuit output signal to form a filtered signal, the filter circuit for filtering the TIA circuit output signal in dependence upon a component of the first bias signal and for providing the filtered signal to a filter output port thereof.