Image sensors including offset adjustment and related methods

Image analysis – Image sensing

Reexamination Certificate

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C348S294000

Reexamination Certificate

active

10438165

ABSTRACT:
An image sensor includes a photosensitive element that generates an electrical signal corresponding to light incident thereon and a ramp signal generator that generates a ramp signal. Generation of the ramp signal is initiated in response to activation of a ramp enable signal. An offset adjusting circuit generates a counter enable signal after activation of the ramp enable signal and after initiating generation of the ramp signal. A counter initiates counting responsive to generation of the counter enable signal. A latch latches a counter output responsive to a comparison of the ramp signal and the electrical signal corresponding to light incident on the photosensitive element. Related methods are also discussed.

REFERENCES:
patent: 5877715 (1999-03-01), Gowda et al.
patent: 5982318 (1999-11-01), Yiannoulos et al.
patent: 6067113 (2000-05-01), Hurwitz et al.
patent: 6590610 (2003-07-01), Castro et al.
Ludwig et al. “On-Focal Plane Analog-to-Digital Conversion with Detector Gain and Offset Compensation”Proceedings of the SPIEpart 1097 pp. 73-84 (1989).
Netherlands Industrial Property Office Search Report for Netherlands application No. NL 1023152 mailed on Mar. 23, 2005.

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