Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/7752
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

A calibration technique for very low current and compact tunable neuromorphic cells: Application to 5-bit 20nA DACs

AuthorsLeñero-Bardallo, J. A.; Serrano-Gotarredona, Teresa CSIC ORCID ; Linares-Barranco, Bernabé CSIC ORCID
KeywordsAnalog
Calibration
Mismatch
Subthreshold
Issue DateJun-2008
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEE Transactions on Circuits and Systems II: Express Briefs 55(6): 522-526 (2008)
AbstractLow current applications, like neuromorphic circuits, where operating currents can be as low as a few nanoamperes or less, suffer from huge transistor mismatches, resulting in around or less than 1-bit precisions. Recently, a neuromorphic programmable- kernel 2-D convolution chip has been reported where each pixel included two compact calibrated digital-to-analog converters (DACs) of 5-bit resolution, for currents down to picoamperes. Those DACs were based on MOS ladder structures, which although compact require unit transistors ( is the number of calibration bits). Here, we present a new calibration approach not based on ladders, but on individually calibratable current sources made with MOS transistors of digitally adjustable length, which require only -sized transistors. The scheme includes a translinear circuit-based tuning scheme, which allows us to expand the operating range of the calibrated circuits with graceful precision degradation, over four decades of operating currents. Experimental results are provided for 5-bit resolution DACs operating at 20 nA using two different translinear tuning schemes. Maximum measured precision is 5.05 and 7.15 b, respectively, for the two DAC schemes.
Publisher version (URL)http://dx.doi.org/10.1109/TCSII.2007.916864
URIhttp://hdl.handle.net/10261/7752
DOI10.1109/TCSII.2007.916864
ISSN1549-7747
Appears in Collections:(IMSE-CNM) Artículos

Files in This Item:
File Description SizeFormat
calibration techniques.pdf672,49 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work

SCOPUSTM   
Citations

14
checked on Jan 26, 2022

WEB OF SCIENCETM
Citations

11
checked on Jan 27, 2022

Page view(s)

330
checked on Jan 26, 2022

Download(s)

330
checked on Jan 26, 2022

Google ScholarTM

Check

Altmetric

Dimensions


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.