Single-chip CMOS APS camera with direct frame difference output

  • Ma S
  • Chen L
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Abstract

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 32.2×32.2
μm2 of chip area with a fill factor of 33%. A 128×98
element prototype camera chip with an on-chip 8-bit analog-to-digital
converter has been fabricated in a 0.5-μm 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

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Authors

  • Shyh Yih Ma

  • Liang Gee Chen

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