A single-chip CMOS APS camera with direct frame difference output

A complementary metal-oxide-semiconductor (CMOS) active pixel sensor (APS) camera chip with direct frame difference output is reported in this paper. The proposed APS cell circuit has in-pixel storage for previous frame image data so that the current frame image and the previous frame image can be r...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1999-10, Vol.34 (10), p.1415-1418
Main Authors: Ma, Shyh-Yih, Chen, Liang-Gee
Format: Article
Language:English
Subjects:
Cameras
Chips
Circuits
CMOS
CMOS image sensors
CMOS process
Frames
Image storage
Low voltage
Motion detection
Pixel
Pixels
Power supplies
Sensor arrays
Voltage
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Summary:A complementary metal-oxide-semiconductor (CMOS) active pixel sensor (APS) camera chip with direct frame difference output is reported in this paper. The proposed APS cell circuit has in-pixel storage for previous frame image data so that the current frame image and the previous frame image can be read out simultaneously in differential mode. The signal swing of the pixel circuit is maximized for low supply voltage operation. The pixel circuit occupies 32.2/spl times/32.2 /spl mu/m/sup 2/ of chip area with a fill factor of 33%. A 128/spl times/98 element prototype camera chip with an on-chip 8-bit analog-to-digital converter has been fabricated in a 0.5-/spl mu/m double-poly double-metal CMOS process and successfully tested. The camera chip consumes 56 mW at 30 frames/s with 3.3 V power supply.
ISSN:0018-9200
1558-173X
DOI:10.1109/4.792618