Patent ID: 7403065

Claim:
A capacitive differential transimpedance amplifier circuit, comprising: a differential output amplifier, the differential output amplifier having a pair of inputs and a pair of outputs, the pair of inputs comprising a first inverting input and a first non-inverting input, and the pair of outputs comprising a first inverting output and a first non-inverting output; a pair of detection elements; a first input node, the first input node being connected to the first inverting input, wherein a first input signal from a first detection element of the pair of detection elements is direct-current-coupled through the first input node to the first inverting input; a second input node, the second input node being connected to the first non-inverting input, wherein a second input signal from a second detection element of the pair of detection elements is direct-current-coupled through the second input node to the first non-inverting input; an inverting-input feedback capacitor connected between the first inverting input and the first non-inverting output; a non-inverting-input feedback capacitor connected between the first non-inverting input and the first inverting output; an inverting-input reset switch means connected in parallel with the inverting-input feedback capacitor between the first inverting input and the first non-inverting output; and a non-inverting-input reset switch means connected in parallel with the non-inverting-input feedback capacitor between the first non-inverting input and the first inverting output.