Patent ID: 7336808

Claim:
A photodetector comprising: a plurality of photodiodes, each generating charges of an amount that is in accordance with the intensity of incident light; and integrating circuits, each including an amplifier, having a differential pair input part at the input end side and a drive part at the output end side, and a capacitor and a switch, which are disposed between said input end and said output end of said amplifier, and, when said switch is opened, accumulating, in the capacitor, charges input into said input end from an above-mentioned photodiode and outputting, from said output end, a voltage that is in accordance with the amount of charges accumulated in said capacitor, said plurality of photodiodes being disposed on a first substrate, said capacitors and said differential pair input parts being disposed on a second substrate, said drive parts being disposed on a third substrate, and said photodiodes and said input ends of said integrating circuits being electrically connected to each other by said first substrate and said second substrate being bump-connected to each other.