Patent ID: 9640700
Date: 2017-05-02
CPC Classifications: H01L,H03F

Claim:
1. An optical sensor comprising: a photodiode which generates a photocurrent upon receipt of light; a first MOS transistor through which the photocurrent flows; a second MOS transistor which forms, together with the first MOS transistor, a current mirror circuit; a third MOS transistor whose channel type is different from that of the first MOS transistor; and a current-voltage conversion element which converts, to a voltage, a current flowing through the second MOS transistor, the current mirror circuit amplifying the photocurrent, the first MOS transistor having a source connected with a gate of the third MOS transistor, and the third MOS transistor having a threshold voltage that is set to be equal to or above a threshold voltage of the first MOS transistor.