Patent ID: 6825878
Filing Date: 2004-11-30
Classification: H01L

Abstract:
An imaging device comprising:at least one pixel circuit including: a photosensitive device within a substrate for accumulating photo-generated charge; a floating diffusion node formed in said substrate for receiving and storing charges from said photosensitive device; at least one transistor formed on said substrate having a first voltage threshold which is used in operating said pixel; an output node for providing a pixel signal; and a readout circuit comprising at least one transistor which is formed on said substrate used in operation of said readout circuit, said at least one transistor being coupled to receive a signal from said pixel output node and having a second voltage threshold which is lower than said first voltage threshold, said at least one transistor providing an output signal based on a signal received from said pixel circuit; and a substrate voltage pump coupled to a supply voltage and connected to supply said substrate with a voltage.