27 April 1999 1.5-FET-per-pixel standard CMOS active column sensor
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey J. Zarnowski, Jeffrey J. Zarnowski, Matthew A. Pace, Matthew A. Pace, Michael Joyner, Michael Joyner, "1.5-FET-per-pixel standard CMOS active column sensor", Proc. SPIE 3649, Sensors, Cameras, and Systems for Scientific/Industrial Applications, (27 April 1999); doi: 10.1117/12.347074; https://doi.org/10.1117/12.347074

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