Patent ID: 7368771

Claim:
A complementary metal-oxide semiconductor (CMOS) image sensor comprising: a photodiode formed in a semiconductor substrate; a floating node formed in the semiconductor substrate and connected to the photodiode; a drive transistor comprising a gate formed on the semiconductor substrate and connected to the floating node, and a source and a drain formed in the semiconductor substrate and doped with impurities of first conductivity, one of which is connected to a supply voltage; a reset transistor comprising a source and a drain formed in the semiconductor substrate and doped with the impurities of the first conductivity, one of which is connected to the floating node; and a selection transistor comprising a source and a drain formed in the semiconductor substrate and doped with the impurities of the first conductivity, one of which is connected to the source or drain of the drive transistor, wherein the drive transistor comprises a threshold voltage adjustment region doped with the impurities of the first conductivity in a portion of the semiconductor substrate where a channel is formed.