A flexible structure of standard cell and its optimization method for near-threshold voltage operation

Shinichi Nishizawa*, Tohru Ishihara, Hidetoshi Onodera

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

With ever growing demands of mobile devices, low power consumption has become essential for VLSI circuits. Since standard cell libraries are typically used in many parts of VLSI circuits, their performance has a strong impact on realizing high speed and low power VLSI circuits. One of the most promising approaches for reducing the power consumption of the circuit is lowering the supply voltage. However this causes an increase of imbalance between rise and fall delays especially for cells having transistor stacks. For mitigating this imbalance, this paper proposes a structure of standard cells where the P/N ratio of each cell can be independently customized for near-threshold operation in VLSI circuits. The structure cancels the imbalance between rise and fall delays at the expense of cell area. The experiments with ISCAS'85 benchmark circuits demonstrate that the standard cell library consisting of the proposed cells reduces the power consumption of the benchmark circuits by 16% on average without increasing the circuit area, compared to that of the same circuit synthesized with a library which is not optimized for the near-threshold operation.

Original languageEnglish
Title of host publication2012 IEEE 30th International Conference on Computer Design, ICCD 2012
Pages235-240
Number of pages6
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 IEEE 30th International Conference on Computer Design, ICCD 2012 - Montreal, QC, Canada
Duration: 2012 Sep 302012 Oct 3

Publication series

NameProceedings - IEEE International Conference on Computer Design: VLSI in Computers and Processors
ISSN (Print)1063-6404

Conference

Conference2012 IEEE 30th International Conference on Computer Design, ICCD 2012
Country/TerritoryCanada
CityMontreal, QC
Period12/9/3012/10/3

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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