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Title

A spatial contrast retina with on-chip calibration for neuromorphic spike-based AER vision systems

AuthorsCostas-Santos, J.; Serrano-Gotarredona, Teresa ; Serrano-Gotarredona, Rafael; Linares-Barranco, Bernabé
KeywordsAddress-event representation (AER)
Analog circuits
Artifical retina
Calibration
Issue Date16-Oct-2008
CitationIEEE Transactions on Circuits and Systems I: Regular Papers 54(7): 1444-1458 (2007)
AbstractWe 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.
Publisher version (URL)http://dx.doi.org/10.1109/TCSI.2007.900179
URIhttp://hdl.handle.net/10261/7808
DOI10.1109/TCSI.2007.900179
ISSN1549-8328
Appears in Collections:(IMSE-CNM) Artículos
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