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An ultra-low power visual motion sensor based on the time stamped pixel structure is presented in this paper. Both the current-clamping circuits in the edge detector and the static logic circuit in the time stamp component are developed to allow the pixel dissipating tens of nanowatt power. In addition, both proposed edge detector and time stamp component reduce the pixel size simultaneously. Implemented in a CMOS 0.35μm process, a 2D vision motion sensor of 32×32 arrays only consumes 35nW/pixel with the chip area of (40μm×40μm)/pixel.
Date of Conference: 12-16 Sept. 2005