CMOS Image Sensor Using Negative-Feedback Resetting to Obtain Variably Smoothed Images

Masayuki IKEBE  Keita SAITO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.11   pp.1662-1669
Publication Date: 2006/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.11.1662
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Novel Device Architectures and System Integration Technologies)
Category: 
Keyword: 
CMOS-image sensor,  negative feedback reset,  filtersize,  

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Summary: 
We designed a CMOS image sensor capable of capturing variably smoothed images. This sensor uses a negative-feedback technique to set photodiode (PD) capacitance in the pixel circuit to any intermediate voltage during charge accumulation and it provides a neighboring-pixel operation by using their average value when resetting the PD capacitance. Smoothing-filter coefficients are changed by adjusting timing of the pixel-readout and neighboring-pixels operations. The performance of the proposed sensor was evaluated by SPICE simulation and numerical analysis.