Patent ID: 8704583

Claim:
A current-integrating amplifier circuit, comprising: an input amplifier stage having an input node, a first output node, and a first switch connected between the first output node and a power supply node; and an output offset circuit connected to the first output node of the input amplifier stage and to a second output node of the current-integrating amplifier circuit, wherein the output offset circuit comprises: a first series capacitor coupled between the first output node of the input amplifier stage and the second output node of the current-integrating amplifier circuit: and a first bias voltage generator circuit to generate a first bias voltage on a first bias voltage node; wherein the output offset circuit adds a DC offset to die second output node of the current-integrating amplifier circuit by switchably connecting the second output node to the first bias voltage node to charge the first series capacitor with the first bias voltage, wherein the first switch is driven by a first clock signal to switchably connect the power supply node to the first output node during a “reset” period of operation of the current-integrating amplifier circuit.