Patent ID: 8013412

Claim:
A photodetector comprising: an integrated circuit; at least two optically sensitive layers, a first optically sensitive layer and a second optically sensitive layer, the first optically sensitive layer over at least a portion of the integrated circuit and the second optically sensitive layer over the first optically sensitive layer; a plurality of electrodes including at least two electrodes between which the two optically sensitive layers are interposed, the electrodes including a respective first electrode and a respective second electrode; and circuitry coupled to the integrated circuit, the circuitry comprising compensation circuitry and bandgap reference circuitry, the compensation circuitry to apply black level correction that compensates for a difference between dark currents among the at least two optically sensitive layers by applying a plurality of dark current compensations to the signal, the circuitry outputting signals from the optically sensitive layers, the signals corresponding to light absorbed by the optically sensitive layers.