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CMOS Image Sensor with Self Reset Pixel Architecture


Stanford Reference:

99-060


Abstract


By integrating image detection and processing on a single chip, CMOS sensors provide a great advantage over CCD sensors. However, as technology scales, the CMOS sensor's dynamic range and signal-to-noise ratio (SNR) decrease dramatically. The CMOS image sensor overcomes this effect by utilizing self-reset pixel architecture, in which pixels reset when their collected charge reaches well capacity. In this way, the pixels can continue collecting charge far above the supply voltage, thereby providing for reasonable dynamic range and high SNR.

Applications


  • Digital imaging systems such as digital cameras

Advantages


  • Sensor will work even as CMOS scales downward below 0.25 um
  • Much improved image quality due to extended dynamic range and better SNR

Publications


  • X.Q. Liu, CMOS Image Sensors Dynamic Range and SNR Enhancement via Statistical Signal Processing , Ph.D Thesis, Stanford University, CA, 2002.

Innovators & Portfolio



Patent Status



Date Released

 11/6/2002
 

Licensing Contact


Linda Chao, Senior Associate
(650) 725-9408 (Direct)
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Related Keywords


imaging   semiconductors   
 

   

  

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