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Wide-Dynamic-Range Digital-Pixel CMOS Image Sensor Applying New Readout Operation
Masahide GOTO Toshihisa WATABE Hiroshi OHTAKE Masahide ABE Norifumi EGAMI Kenkichi TANIOKA
IEICE TRANSACTIONS on Electronics
Publication Date: 2006/02/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
CMOS image sensor, dynamic range, A/D converter, threshold, pulse,
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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.