Patent ID: 7936388
Filing Date: 2011-05-03
Classification: H04N

Abstract:
1. An apparatus comprising: a pixel adapted to receive light and to output a pixel output signal representative of the received light; and feedback circuitry, coupled to the pixel, adapted to receive said pixel output signal and to provide multiple feedback signals to the pixel at least during a reset stage of the pixel; wherein the multiple feedback signals comprise a feedback voltage signal V 0 ; wherein the pixel substantially consists of a light sensitive element, a reset transistor, an amplifying transistor and a read transistor; wherein a readout output of the pixel is arranged to receive a current Io that equals Kt*(V 0 -Vt) 2 ; wherein Kt is a gain coefficient representative of characteristics of the reset transistor; V 0 is provided to a drain of the reset transistor; and Vt is a threshold voltage of the reset transistor.