Patent ID: 8450673

Claim:
An imaging integrated circuit, the imaging integrated circuit comprising: a pixel circuit array, wherein the pixel circuit array comprises a plurality of pixel circuits, and wherein each pixel circuit of the plurality of pixel circuits is configured to store a reference signal produced by background noise of the pixel circuit and to store a signal produced by optical exposure of a photodetector of the pixel circuit and the background noise of the pixel circuit; and a charge acquisition circuit configured to read out image information obtained by the pixel circuit array, wherein the charge acquisition circuit comprises: a first amplifier; a differential integrator connected in series with the first amplifier, wherein the differential integrator comprises: a second amplifier, wherein the first amplifier is used as a common mode regulator for the second amplifier; a first differential integrator section; and a second differential integrator section, wherein each of the first and second differential integrator sections includes a capacitor, a first switch, a second switch, and a third switch, wherein the capacitor is connected in series with the second switch, the first switch is connected in parallel with the capacitor and the second switch, and the third switch is connected to the capacitor, the second switch and a common mode reference voltage terminal, and wherein the first switch and the third switch are controlled by a first control signal and the second switch is controlled by a second control signal.