Patent ID: 7385170
Filing Date: 2008-06-10
Classification: H03F

Abstract:
1. An optical receiver circuit comprising the following: a photodiode configured to generate a current when exposed to light, the photodiode having an anode terminal and a cathode terminal; a first trans-impedance amplifier having an input terminal coupled to one of the cathode or the anode terminal of the photodiode, the first transimpedance amplifier further having an output terminal; a first ambient light suppression circuit in a first feedback loop between the output terminal of the first trans-impedance amplifier and the input terminal of the first trans-impedance amplifier; a second trans-impedance amplifier having an input terminal coupled to the other of the cathode or the anode terminal of the photodiode, the second transimpedance amplifier further having an output terminal; and a second ambient light suppression circuit in a second feedback loop between the output terminal of the second trans-impedance amplifier and the input terminal of the second trans-impedance amplifier.