Patent ID: 7602430

Claim:
A CMOS active pixel sensor comprising: a red photodiode coupled to a red sense node; a green photodiode coupled to a green sense node; a plurality of blue photodiodes, each blue photodiode coupled to a blue sense node through a different n-channel MOS blue-select transistor having a gate coupled to a different blue select line; an n-channel MOS blue reset transistor having a drain coupled to a supply node, a source coupled to the blue sense node, and a gate coupled to a reset control line; an n-channel MOS source-follower transistor having a gate coupled to the blue sense node, a drain coupled to a source-follower supply node, and a source; a blue row-select transistor having a drain coupled to the source of the source-follower transistor, a source coupled to a blue column output line and a gate coupled to a blue row-select line; an n-channel MOS red amplifier transistor having a gate coupled to the red sense node, a drain coupled to a supply node, and a source; an n-channel MOS red reset transistor having a drain coupled to the drain of the n-channel MOS red amplifier transistor, a source coupled to the red sense node, and a gate coupled to a reset 2 control line; a red feedback capacitor coupled between the red sense node and the drain of the n-channel MOS red reset transistor; a red row-select transistor having a drain coupled to the source of the n-channel MOS red amplifier transistor, a source coupled to a red column output line and a gate coupled to a red-green row-select line; an n-channel MOS green amplifier transistor having a gate coupled to the green sense node, a drain coupled to a supply node, and a source; an n-channel MOS green reset transistor having a drain coupled to the drain of the n-channel MOS green amplifier transistor, a source coupled to the green sense node, and a gate coupled to the reset 2 control line; a green feedback capacitor coupled between the green sense node and the drain of the n-channel MOS green reset transistor; and a green row-select transistor having a drain coupled to the source of the n-channel MOS green amplifier transistor, a source coupled to a green column output line and a gate coupled to the red-green row-select line.