Patent ID: 6956439

Claim:
An apparatus including a transimpedance amplifier with controllable noise reduction, comprising: amplifier circuitry including input and output terminals, and responsive to reception of an input signal and a compensation signal via said input terminal by providing an output signal via said output terminal, wherein said input signal includes an AC component and a DC component, said compensation signal includes a DC component inverse in polarity to said input signal DC component, and said output signal includes an AC component corresponding to said input signal AC component, and a DC component comprising a sum of first and second DC subcomponents, wherein said first DC subcomponent corresponds to said input signal DC component; and control circuitry coupled to said amplifier circuitry input and output terminals, and responsive to reception of said output signal DC component and a reference signal including a DC component by providing said compensation signal, wherein said reference signal DC component comprises a sum of third and fourth DC subcomponents, said third DC subcomponent corresponds to said second DC subcomponent, and said compensation signal DC component corresponds to a difference between said first and fourth DC subcomponents.