Patent ID: 7326904

Claim:
An active pixel sensor, comprising: a plurality of pixels, wherein each of said pixels comprises: a reset portion for resetting a photosensitive element of said pixel; a capacitor coupled between a clamp switch and a first source follower transistor of said reset portion, said capacitor being configured to store a reset voltage of said photosensitive element; a column bus coupled to a storage node for receiving said reset voltage level; a gate of a second source follower transistor coupled to said capacitor and said clamp switch, said second source follower transistor switchably coupling said capacitor to said column bus; a first source/drain terminal of a load transistor coupled to ground; a second source/drain terminal of said load transistor coupled to said first source follower transistor and said storage capacitor; and a selection transistor coupled between said load transistor and ground for controlling selection of said reset portion.