Share Email Print

Proceedings Paper

Noise minimization via deep submicron system-on-chip integration in megapixel CMOS imaging sensors
Author(s): Lester J. Kozlowski
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Infrared sensor designers have long maximized S/N ratio by employing pixel-based amplification in conjunction with supplemental noise suppression. Instead, we suppress photodiode noise using novel SoC implementation with simple three transistor pixel; supporting SoC components include a feedback amplifier having elements distributed amongst the pixel and column buffer, a tapered reset clock waveform, and reset timing generator. The tapered reset method does not swell pixel area, compel processing of the correlated reset and signal values, or require additional memory. Integrated in a 2.1M pixel imager developed for generating high definition television, random noise is ~8e- at video rates to 225MHz. Random noise of ~30e- would otherwise be predicted for the 5μm by 5μm pixels having 5.5fF detector capacitance with negligible image lag. Minimum sensor S/N ratio is 52dB with 1920 by 1080 progressive readout at 60Hz, 72Hz and 90Hz. Fixed pattern noise is <2 DN via on-chip signal processing.

Paper Details

Date Published: 29 September 2005
PDF: 13 pages
Proc. SPIE 5957, Infrared Photoelectronics, 595701 (29 September 2005); doi: 10.1117/12.626828
Show Author Affiliations
Lester J. Kozlowski, AltaSens, Inc. (United States)

Published in SPIE Proceedings Vol. 5957:
Infrared Photoelectronics
Antoni Rogalski; Eustace L. Dereniak; Fiodor F. Sizov, Editor(s)

© SPIE. Terms of Use
Back to Top