PHOTODETECTING CIRCUIT, OPTICAL RECEIVER, AND PHOTOCURRENT MEASUREMENT METHOD FOR PHOTO DETECTOR

摘要

The present invention is a photodetecting circuit comprising a plurality of operational amplifiers provided so as to correspond to respective photo detectors disposed on a common semiconductor substrate, each operational amplifier having an inverting input terminal connected to a cathode of the photo detector and a non-inverting input terminal supplied with a voltage to be applied to the photo detector; a plurality of resistances connected between output terminals and inverting input terminals of the respective operational amplifiers; and a terminal, disposed on at least the inverting input terminal side in both ends of the resistance, for connecting with a meter for measuring a photocurrent of the photo detector.