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Analysis and optimization for dynamic read stability in 28nm SRAM bitcells

  • Ahmed T. Elthakeb
  • , Thomas Haine
  • , Denis Flandre
  • , Yehea Ismail
  • , Hamdy Abd Elhamid
  • , David Bol
  • American University in Cairo
  • Université catholique de Louvain

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The importance of the dynamic analysis for SRAM operation increases as a result of shrinking access cycle time, voltage scaling and increased process variations. In this paper, quantitative study of the dynamic read noise margin (DNM) is introduced showing the evolution from the static read noise margin (SNM) to DNM through cumulative dynamic effects in 28nm FDSOI. The impact of parasitic capacitances on the DNM is further analyzed. Finally, we show that by sizing for a 150-mV DNM instead of a 150-mV SNM and by inserting two 0.5fF extra caps in the bitcell allows reducing the pull-down NMOS width by a factor 3.5×.

Original languageEnglish
Title of host publication2015 IEEE International Symposium on Circuits and Systems, ISCAS 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1414-1417
Number of pages4
ISBN (Electronic)9781479983919
DOIs
StatePublished - 27 Jul 2015
Externally publishedYes
EventIEEE International Symposium on Circuits and Systems, ISCAS 2015 - Lisbon, Portugal
Duration: 24 May 201527 May 2015

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2015-July
ISSN (Print)0271-4310

Conference

ConferenceIEEE International Symposium on Circuits and Systems, ISCAS 2015
Country/TerritoryPortugal
CityLisbon
Period24/05/1527/05/15

Keywords

  • 6T SRAM
  • Cell sizing
  • Dynamic behavior
  • FD SOI
  • Read Noise Margin
  • parasitic capacitances

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