Drive-Strength Selection for Synthesis of Leakage-Dominant Circuits

A. K.M.Mahfuzul Islam, Shinichi Nishizawa, Yusuke Matsui, Yoshinobu Ichida

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

1 Citation (Scopus)

Abstract

For a highly duty-cycled IoT device, the circuit spends most of the time in sleep mode. As a result, leakage-energy becomes the dominant energy consumption source. Therefore, circuit design to minimize the leakage-power has become a critical issue. The state-of-the-art standard-cell library is optimized for high-performance designs and is power-hungry. We show that choosing a suitable set of drive-strengths can reduce the leakage-energy by order magnitudes for highly duty-cycled devices. To realize the suitable set, cells with larger gate-lengths or stacked devices are essential although they increase cell area and gate capacitance. The holistic property of a standard-cell library ensures that a better circuit can be synthesized with the slow cells in the library. We have compared two libraries with one being 'thin dense' in its drive-strength varieties, while the other being fat and sparse. Synthesis results using ISCAS'85 circuits show a maximum of 1/5 reduction of leakage-power with our proposed 'fat sparse' library than that with a conventional 'thin dense' library.

Original languageEnglish
Title of host publicationProceedings of the 20th International Symposium on Quality Electronic Design, ISQED 2019
PublisherIEEE Computer Society
Pages298-303
Number of pages6
ISBN (Electronic)9781728103921
DOIs
Publication statusPublished - 2019 Apr 23
Externally publishedYes
Event20th International Symposium on Quality Electronic Design, ISQED 2019 - Santa Clara, United States
Duration: 2019 Mar 62019 Mar 7

Publication series

NameProceedings - International Symposium on Quality Electronic Design, ISQED
Volume2019-March
ISSN (Print)1948-3287
ISSN (Electronic)1948-3295

Conference

Conference20th International Symposium on Quality Electronic Design, ISQED 2019
Country/TerritoryUnited States
CitySanta Clara
Period19/3/619/3/7

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering
  • Safety, Risk, Reliability and Quality

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