Patent ID: 6809596
Filing Date: 2004-10-26
Classification: H03F

Abstract:
A transimpedance amplifier comprising:a single ended input terminal to receive an input signal from a photodiode, the input signal comprising a composite signal comprising a DC current component and an AC current component; differential output terminals to provide an output signal in response to the input signal; a resistor coupled between the single ended input terminal and one of the differential output terminals; an amplifier to provide an amplified voltage signal in response to a voltage representative of the composite signal, the amplifier comprising input terminals coupled across the resistor to receive the voltage signal representative of the composite signal; a filter to provide a filtered voltage signal having a magnitude that is representative of a magnitude of the DC current component in response to the amplified voltage signal; and a DC current removal circuit coupled to the single ended input terminal to remove at least a portion of the DC current component from the input signal in response to the filtered voltage signal.