Current mode image sensor with two transistors per pixel

Authors:
Viktor Gruev;Zheng Yang;Jan Van Der Spiegel;Ralph Etienne-Cummings
Affiliations:
Department of Computer Science and Engineering, Washington University, St. Louis, MO and University of Pennsylvania, Philadelphia, PA;Electrical and Systems Engineering Department, University of Pennsylvania, Philadelphia, PA;Electrical and Systems Engineering Department, University of Pennsylvania, Philadelphia, PA;Electrical and Computer Engineering Department, Johns Hopkins University, Baltimore, MD
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Year:
2010

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Abstract

A linear current mode active pixel sensor for low fixed-pattern noise imaging is presented. The photo pixel is composed of a photodiode, a reset transistor, and a transconductance amplifier transistor. The address switch transistor is placed outside the pixel. The increased linearity of the pixel current coupled WIth current mode difference double sampling greatly reduces spatial variations across the image sensor array. The fabricated image sensor is composed of an array of 50 × 128 pixels and consumes 5 m W at 30 fps. Column fixed pattern noise of 0.1 % from the saturated current and signal to noise ratio of 43.3 dB is achieved.