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A 1-mW CMOS Temporal-Difference AER Sensor for Wireless Sensor Networks

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4 Author(s)
Dongsoo Kim ; Electr. Eng. Dept., Yale Univ., New Haven, CT, USA ; Zhengming Fu ; Park, Joon Hyuk ; Culurciello, E.

In this paper, we report a 64 times 64 active pixel sensor, designed for low-power image sensing for wireless sensor networks. The proposed image sensor computes the temporal difference between two continuous frames and communicates them in an address-event representation format. The image sensor is capable of computing 30 temporal-difference frames per second (fps) and consumes 1 mW with a 3-V power supply. Light-intensity images are also available as an output at a speed of 60 fps. The image sensor was fabricated in a 0.5-mum bulk CMOS process. The fabricated sensor was tested with various stimuli to evaluate its performance. The die size is 3 mm times 3 mm, including pads and test structures. Each pixel occupies an area of 29 times 28 mum2 with a fill factor of 23%. The minimum detectable speed of the temporal-difference is 4.5deg/s.

Published in:

Electron Devices, IEEE Transactions on  (Volume:56 ,  Issue: 11 )

Date of Publication:

Nov. 2009

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