Patent ID: 7561812

Claim:
An optical receiver comprising: a voltage supply; a first node; a second node; a differential amplifier having a first input coupled to the first node and a second input coupled to the second node; a photodetector coupled between the voltage supply and the first node, the photodetector having a photodetector capacitance; and a programmable variable capacitor coupled between the voltage supply and the second node having a capacitance selectively matched to the photodetector capacitance; wherein the differential amplifier and the programmable variable capacitor are incorporated in an integrated circuit, the photodetector is extrinsic to the integrated circuit, and the integrated circuit further includes: a trimming control block, wherein the trimming control block includes: a comparator switchably coupled to the first node and to the second node and a first capacitor between the comparator and ground switchably coupled to the first node and a second capacitor between the comparator and ground switchably coupled to the second node.