Patent ID: 8629524

Claim:
An apparatus comprising: a backside illuminated image sensor chip comprising: a first transistor adjacent to a first side of the backside illuminated image sensor chip; a first bonding pad formed in the first side of the backside illuminated image sensor chip; and a photo active region adjacent to a second side of the backside illuminated image sensor chip; a second chip comprising: a second transistor; an input/output pad formed on a second side of the second chip; a second through via coupled between the second transistor and the input/output pad; and a second bonding pad formed in a first side of the second chip, wherein the second chip and the backside illuminated image sensor chip are face-to-face bonded together, and wherein the first bonding pad is electrically coupled to the second bonding pad; and an input/output terminal formed on a second side of the second chip, wherein the input/output terminal is coupled to the backside illuminated image sensor chip through a through via embedded in the second chip.