Selective smile formation under transfer gate in a CMOS image sensor pixel

摘要

A pixel includes a photodiode and a transfer transistor. The transfer transistor is formed between the photodiode and a floating node and selectively operative to transfer a signal from the photodiode to the floating node. The transfer transistor has a bird's beak structure formed at the interface of its transfer gate and said floating node. Also included is a reset transistor for resetting the floating node to a voltage reference and an amplification transistor controlled by the floating node.