Leakage power-aware clock skew scheduling: Converting stolen time into leakage power reduction

Min Ni*, Seda Ogrenci Memik

*Corresponding author for this work

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

9 Scopus citations


Clock skew scheduling has been traditionally considered as a tool for improving the clock period in a sequential circuit. Timing slack is "stolen" from fast combinational blocks to be used by slower blocks to meet a more stringent clock cycle time. Instead, we can leverage on the borrowed time to achieve leakage power reduction during gate sizing and/or dual Vth assignment. In this paper, we present the first approach to the best of our knowledge for integrating clock skew scheduling, threshold voltage assignment, and gate sizing into one optimization formulation. Over 29 circuits in the ISCAS89 benchmark suite, this integrated approach can reduce leakage power by as much as 55.83% and by 18.79% on average, compared to using combinational circuit based power optimization on each combinational block without considering clock skews. Using a 65nm dual Vth technology library, this corresponds to a 23.87% peak reduction (6.15% on average) in total power at the ambient operating temperature. The average total power reduction further increases to 9.83% if the high temperature library of the same process technology is used.

Original languageEnglish (US)
Title of host publicationProceedings of the 45th Design Automation Conference, DAC
Number of pages4
StatePublished - Sep 17 2008
Event45th Design Automation Conference, DAC - Anaheim, CA, United States
Duration: Jun 8 2008Jun 13 2008

Publication series

NameProceedings - Design Automation Conference
ISSN (Print)0738-100X


Other45th Design Automation Conference, DAC
Country/TerritoryUnited States
CityAnaheim, CA


  • Clock skew scheduling
  • Dual-Vth
  • Gate sizing
  • Leakage power optimization

ASJC Scopus subject areas

  • Hardware and Architecture
  • Control and Systems Engineering


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