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Proceedings Paper

A wide dynamic range CMOS image sensor with an adjustable logarithmic response
Author(s): Hsiu-Yu Cheng; Bhaskar Choubey; Steve Collins
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Paper Abstract

A wide dynamic image CMOS image sensor with a user adjustable logarithmic photo-response is presented. A pMOS switch and a time-dependent reference voltage are integrated into a three-transistor (3T) pixel structure to implement a logarithmic response. Several pixels have been manufactured using a 0.25μm standard CMOS technology. Compared to the conventional logarithmic response pixel based on a diode-connected transistor, the proposed pixel combines a wide dynamic range of 120dB with much higher responsivity (250mV/decade) and better dark response.

Paper Details

Date Published: 21 February 2008
PDF: 8 pages
Proc. SPIE 6816, Sensors, Cameras, and Systems for Industrial/Scientific Applications IX, 681602 (21 February 2008); doi: 10.1117/12.760394
Show Author Affiliations
Hsiu-Yu Cheng, Univ. of Oxford (United Kingdom)
Bhaskar Choubey, Univ. of Oxford (United Kingdom)
Steve Collins, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 6816:
Sensors, Cameras, and Systems for Industrial/Scientific Applications IX
Morley M. Blouke; Erik Bodegom, Editor(s)

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