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Proceedings Paper

A versatile wide dynamic range pixel with an improved low-light sensitivity
Author(s): Hsiu-Yu Cheng; Steve Collins
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Paper Abstract

A novel CMOS pixel will be described that combines the sensitivity and speed of response at low light levels of an integrating pixel with the wide dynamic range of a logarithmic response. However, as with all pixels, the low-light sensitivity of this novel pixel is ultimately limited by the dark current that flows through the pixel in parallel with the photocurrent. Since the dark current increases rapidly with temperature, this effect is particularly important for cameras that operate in hot environments. Results are reported that show that the dark current in these novel pixels and the temperature dependence of the dark current can both be reduced by careful pixel layout. Alternatively, the user generated function that controls the response of the pixel can be changed to accommodate the dark current and significantly increase the low-light sensitivity of the pixel.

Paper Details

Date Published: 2 October 2008
PDF: 9 pages
Proc. SPIE 7113, Electro-Optical and Infrared Systems: Technology and Applications V, 71130F (2 October 2008); doi: 10.1117/12.799932
Show Author Affiliations
Hsiu-Yu Cheng, Univ. of Oxford (United Kingdom)
Steve Collins, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 7113:
Electro-Optical and Infrared Systems: Technology and Applications V
David A. Huckridge; Reinhard R. Ebert, Editor(s)

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