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18 August 2011 A CMOS imager with negative feedback pixel circuits and its applications
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We investigated a negative feedback method for adding functionality to a CMOS image sensor. Our sensor effectively uses the method to set any intermediate voltage into a photodiode capacitance while a pixel circuit is in motion. The negative feedback reset functions as a noise cancellation technique and can obtain intermediate image data during charge accumulation. As an above application, dynamic range compression is achieved by individually selecting pixels and by setting an intermediate voltage or performing quasi-holding with respect to each pixel. Additionally, we achieved duplicated interlaced processing and were able to output frame-difference images without frame buffers. The experimental results obtained with a chip fabricated using a 0.25-μm CMOS process demonstrate that dynamic range compression and intra-frame motion detection are effective applications of negative feedback resetting.
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Masayuki Ikebe and Junichi Motohisa "A CMOS imager with negative feedback pixel circuits and its applications", Proc. SPIE 8194, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, 819402 (18 August 2011);


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