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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, Matthew A. Pace, and 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);

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