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Proceedings Paper

1.5-FET-per-pixel standard CMOS active column sensor
Author(s): Jeffrey J. Zarnowski; Matthew A. Pace; Michael Joyner
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Paper Abstract

This paper describes a new improved method of employing an amplifier per pixel that eliminates FET threshold and gain variations problems of prior art. Existing amplifier per pixel designs utilizes 3 or 4 FETs per pixel and the amplifier consists of a source follower. The source follower is problematic in 2D arrays due to threshold variations and resulting gain variations per pixel causing extensive peripheral circuitry and/or software to correct. The active column sensor employs a true unity gain amplifier per pixel, eliminating threshold and gain variations. The simplified pixel electronics allow for smaller and/or more sensitive pixels and always at lower cost through improved yields. Disclosure of 1.5 FET double poly, 1.5 FET single poly, and photodiode configurations and with result on various pixels.

Paper Details

Date Published: 27 April 1999
PDF: 11 pages
Proc. SPIE 3649, Sensors, Cameras, and Systems for Scientific/Industrial Applications, (27 April 1999); doi: 10.1117/12.347074
Show Author Affiliations
Jeffrey J. Zarnowski, Photon Vision Systems LLC (United States)
Matthew A. Pace, Photon Vision Systems LLC (United States)
Michael Joyner, Photon Vision Systems LLC (United States)

Published in SPIE Proceedings Vol. 3649:
Sensors, Cameras, and Systems for Scientific/Industrial Applications
Morley M. Blouke; George M. Williams, Editor(s)

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