Patent ID: 6163024
Filing Date: 2000-12-19
Classification: H01L,H04N

Abstract:
A photoelectric transducer comprising:a current mirror circuit comprising:a first pMOS transistor having a source, a gate and a drain, and whose source is connected to a positive power supply,a second pMOS transistor having a source, a gate and a drain, and whose source is connected to the positive power supply, and whose gate and drain are connected to the gate of said first pMOS transistor,a first nMOS transistor having a source, a gate and a drain, and whose source is connected to a reference potential, and whose gate and drain are connected to the drain of said first pMOS transistor, anda second nMOS transistor having a source, a gate and a drain, and whose source is connected to the reference potential via a resistor, whose gate is connected to the gate of said first nMOS transistor, and whose drain is connected to the drain of said second pMOS transistor;a plurality of photosensors comprising a first-conduction-type semiconductor substrate and a plurality of second-conduction-type second semiconductor regions formed near a surface of the first-conduction-type semiconductor substrate, said current mirror circuit and said plurality of photosensors being formed on the same semiconductor substrate; andvoltage drop means provided between the drain of said second nMOS transistor and the drain of said second pMOS transistor.