Adaptive techniques for overcoming performance degradation due to aging in digital circuits

  • Authors:
  • Sanjay V. Kumar;Chris H. Kim;Sachin S. Sapatnekar

  • Affiliations:
  • University of Minnesota, Minneapolis, MN;University of Minnesota, Minneapolis, MN;University of Minnesota, Minneapolis, MN

  • Venue:
  • Proceedings of the 2009 Asia and South Pacific Design Automation Conference
  • Year:
  • 2009

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Abstract

Negative Bias Temperature Instability (NBTI) in PMOS transistors has become a major reliability concern in present-day digital circuit design. Further, with the recent usage of Hf-based high-k dielectrics for gate leakage reduction, Positive Bias Temperature Instability (PBTI), the dual effect in NMOS transistors has also reached significant levels. Consequently, designers are required to build in substantial guard-bands into their designs, leading to large area and power overheads, in order to guarantee reliable operation over the lifetime of a chip. We propose a guard-banding technique based on adaptive body bias (ABB) and adaptive supply voltage (ASV), to recover the performance of an aged circuit, and compare its merits over previous approaches.