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Proceedings Paper

CMOS image sensor with logarithmic response and self-calibrating fixed pattern noise correction
Author(s): Markus Loose; Karlheinz Meier; Johannes Schemmel
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Paper Abstract

Optical CMOS sensor arrays have to cope with the problem of mismatch between individual pixels. This paper describes a CMOS camera chip with logarithmic response that has an automatic analog fixed pattern noise correction on chip. It was fabricated in an 0.8 micron process and consists of 64 X 64 active pixels. The photoreceptors show a measured response of about 100 mV per decade in light intensity and a dynamic range of more than 6 decades. Each pixel includes a capacitor to store the offset correction voltage. After applying the calibration procedure the remaining fixed pattern noise of one column has a standard deviation of 2 mV corresponding to 2 percent of a decade. The result is a system with significantly reduced pixel to pixel variations in comparison to similar uncalibrated photoreceptor arrays.

Paper Details

Date Published: 7 September 1998
PDF: 11 pages
Proc. SPIE 3410, Advanced Focal Plane Arrays and Electronic Cameras II, (7 September 1998); doi: 10.1117/12.324022
Show Author Affiliations
Markus Loose, Univ. Heidelberg (United States)
Karlheinz Meier, Univ. Heidelberg (Germany)
Johannes Schemmel, Univ. Heidelberg (Germany)

Published in SPIE Proceedings Vol. 3410:
Advanced Focal Plane Arrays and Electronic Cameras II
Thierry M. Bernard, Editor(s)

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