Patent ID: 6900485

Claim:
A unit pixel for use in a complementary metal oxide semiconductor (CMOS) image sensor, comprising: a semiconductor substrate including an epitaxial layer in which an active area and a field oxide (FOX) area are defined; a photodiode formed in a predetermined location of the epitaxial layer; a transfer transistor including source/drain regions disposed between the photodiode and a floating diffusion region, wherein a transfer control signal is applied to a gate thereof; a reset transistor including source/drain regions disposed between the floating diffusion region and a power supply voltage (VDD) terminal, wherein a reset control signal is applied to a drain thereof; a drive transistor of which a gate is connected to the floating diffusion region and a drain is connected to the VDD terminal; and a selection transistor of which a drain is connected to a source of the drive transistor and a source is connected to an output terminal, wherein a select control signal is applied to a gate thereof.