Digital CMOS active pixel image sensor for multimedia applications

Details Digital CMOS active pixel image sensor for multimedia applications Digital CMOS active pixel image sensor for multimedia applications

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2894..282z&link_type=abstract

Proc. SPIE Vol. 2894, p. 282-288, Detectors, Focal Plane Arrays, and Applications, William G. Frederick; Junhong Su; Marc Wigdor

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Two charge-scaling successive approximation A/D converters for on-focal-plane column-parallel data processing in CMOS active pixel image sensors (APS) are presented. The converters are designed in a thin but long fashion to fit a pitch size of 40 micrometers for 2.0 micrometers technology and 24 micrometers for 1.2 micrometers technology. Designed for multimedia and other commercial and industrial applications, each in column A/D converter achieves a 8 bit resolution and accuracy with a signal swing of 1 V. Maximum conversion rate exceeding 200 kHz enables high speed digital readout beyond 200 frames/sec for large format 1 K X 1 K CMOS image sensors. A prototype device of 64 X 64 APS image array with 8 bit digital output was demonstrated up to 1 kHz frame rate, and with column-wise non-uniformity less than 2 LSBs.

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