Method and circuit for performing correlated double...

Details Method and circuit for performing correlated double... Method and circuit for performing correlated double...

2005-02-28

2009-06-30

Ho, Tuan V (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

Reexamination Certificate

active

07554584

ABSTRACT:
A method and circuit for performing Correlated Double Sub-Sampling (CDSS) of pixels in an active pixel sensor (APS) array. The method and the apparatus subsamples a plurality (L2) of pixels by: storing L2analog reset charges output from the L2pixels into a first set of (N2) storage capacitors, and combining the (L2) reset charges; storing L2analog image signal charges output from the L2pixels into a second set of (N2) storage capacitors, and combining the (L2) image charges; and then obtaining a differential voltage (VS-VR) by subtracting (in the analog-domain) the voltage (VR) represented by the combined (L2) reset charges from the voltage (VS) represented by the combined (L2) image signal charges. When L equals one, the circuit performs conventional Correlated Double Sampling CDS upon the one pixel.

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