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Título : A spatial contrast retina with on-chip calibration for neuromorphic spike-based AER vision systems
Autor : Costas-Santos, J.; Serrano-Gotarredona, Teresa ; Serrano-Gotarredona, Rafael; Linares-Barranco, Bernabé
Palabras clave : Address-event representation (AER)
Analog circuits
Artifical retina
Calibration
Fecha de publicación : 16-oct-2008
Citación : IEEE Transactions on Circuits and Systems I: Regular Papers 54(7): 1444-1458 (2007)
Resumen: We present a 32 32 pixels contrast retina microchip that provides its output as an address event representation (AER) stream. Spatial contrast is computed as the ratio between pixel photocurrent and a local average between neighboring pixels obtained with a diffuser network. This current-based computation produces an important amount of mismatch between neighboring pixels, because the currents can be as low as a few pico-amperes. Consequently, a compact calibration circuitry has been included to trimm each pixel. Measurements show a reduction in mismatch standard deviation from 57% to 6.6% (indoor light). The paper describes the design of the pixel with its spatial contrast computation and calibration sections. About one third of pixel area is used for a 5-bit calibration circuit. Area of pixel is 58 m 56 m, while its current consumption is about 20 nA at 1-kHz event rate. Extensive experimental results are provided for a prototype fabricated in a standard 0.35- m CMOS process.
Versión del editor: http://dx.doi.org/10.1109/TCSI.2007.900179
URI : http://hdl.handle.net/10261/7808
DOI: 10.1109/TCSI.2007.900179
ISSN: 1549-8328
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