| 摘要 |
A photoelectric transducer having a CMOS constant-current-source circuit which can reduce fixed-pattern noise even if the CMOS constant-current-source circuit and photosensors are formed in the same semiconductor substrate is provided. The photoelectric transducer includes a constant-current-source circuit in which a current mirror circuit including pMOS transistors and a current mirror circuit including nMOS transistors are subjected to tandem connection between power supplies, and a plurality of photosensors formed by a second-conduction-type semiconductor formed near a surface of a first-conduction-type semiconductor substrate. The constant-current-source circuit and the plurality of photosensors are formed on the same semiconductor substrate. A voltage drop circuit is provided at one of tandem connection portions of the current mirror circuits in order to suppress stray carriers present near the plurality of photosensors.
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