Patent ID: 6977603

Claim:
An image sensor, comprising: a single substrate: an image sensor part formed on said substrate adapted to receive a plurality of signals indicative of an image; an analog to digital converter, also formed on said substrate coupled to said image sensor part, and adapted to convert said signals indicative of said image to a digital form, said analog to digital converter further including a resistive portion having a plurality of resistive areas, at least one said area being adapted to produce a non-linear bias adapted to change the digital output signal, wherein said analog to digital converter substantially simultaneously compares one of said plurality of signals indicative of an image with a plurality of reference voltages; and a correlated double sampling element, formed on said substrate, and carrying out a correlated double sampling operation using said plurality of signals and providing an output to said analog to digital converter; wherein said analog to digital converter is a flash analog to digital converter which uses a resistive ladder that is non-uniform.