Wide-Dynamic-Range Digital-Pixel CMOS Image Sensor Applying New Readout Operation

Masahide GOTO  Toshihisa WATABE  Hiroshi OHTAKE  Masahide ABE  Norifumi EGAMI  Kenkichi TANIOKA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.2   pp.206-208
Publication Date: 2006/02/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.2.206
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
CMOS image sensor,  dynamic range,  A/D converter,  threshold,  pulse,  

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Summary: 
A new wide-dynamic-range CMOS image sensor with pixel-level analog-to-digital (A/D) converters is proposed. The pulse-counters in the sensor are arranged outside the pixel area in order to reduce pixel size, which is a key requirement for making high-definition cameras. A new scheme called variable threshold operation is also presented as a suitable readout operation method for the sensor. Experimental measurements on a prototype sensor show that the prototype can obtain linear output response proportional to illumination by applying the new readout operation.