Patent ID: 6552605
Filing Date: 2003-04-22
Classification: H03F

Abstract:
A differential transimpedance amplifier, comprising:a differential transimpedance stage to provide a voltage, wherein the differential transimpedance stage has an inverting transimpedance input, a non-inverting transimpedance input, an inverting transimpedance output, and a non-inverting transimpedance output; a differential transconductance stage to provide a current to the differential transimpedance stage, wherein the differential transconductance stage has an inverting transconductance output and a non-inverting transconductance output, a first feedback element coupled to the non-inverting transimpedance output and the inverting transimpedance input, wherein the first feedback element is further coupled to the inverting transconductance output; and a DC restoration loop, including an operational amplifier coupled between the differential transimpedance stage and an offset current source, wherein the offset current source is coupled to an input of the differential transimpedance amplifier to reduce the DC offset.