On-Chip Fixed-Pattern-Noise Canceling by Negative-Feedback Reset for CMOS Image Sensors

  • Kagaya Ryo
    Graduate School of Information Science and Technology, Hokkaido University
  • Ikebe Masayuki
    Graduate School of Information Science and Technology, Hokkaido University
  • Asai Tetsuya
    Graduate School of Information Science and Technology, Hokkaido University
  • Amemiya Yoshihito
    Graduate School of Information Science and Technology, Hokkaido University

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Other Title
  • 負帰還リセットによるCMOSイメージセンサのバラツキ補償
  • フキカン リセット ニ ヨル CMOS イメージセンサ ノ バラツキ ホショウ

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Abstract

We propose a new method for canceling the fixed-pattern noise in CIVIOS image sensors caused by the threshold mismatch of MOSFETs in pixel circuits. This method uses non-destructive intermediate readout circuitry. We designed a CMOS image sensor in which the canceling circuit was implemented in each column of the pixel-sensor array using a 0.25μm CMOS process. Results from simulations and actual measurements taken revealed that our method would be effective in canceling fixed-pattern-noise in CIVIOS image sensors caused by the threshold mismatch.

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