Patent ID: 7586140

Claim:
A CMOS image sensor, comprising: a field isolation film defining first, second, and third active fields in a substrate having a first conductivity type; a photodiode region in the first active field, the photodiode region having a second conductivity type opposite the first conductivity type; a floating diffusion region of the second conductivity type in the second active field; a source follower gate conductively connected with the floating diffusion region and intersecting the second active field; a first source/drain region of the second conductivity type in the second active field at one side of the source follower gate, the first source/drain region being supplied with a power source voltage; a second source/drain region of the second conductivity type in the second active field at an opposite side of the source follower gate from the first source/drain region, the second source/drain region being spaced from the first source/drain region, and a pickup region in the third active field, the pickup region configured to discharge excess charges generated by hot carriers in a source follower transistor defined by the source follower gate, wherein the third active field is protruded from at least one side of the second active field where the first source/drain region or the second source/drain region is located.