NBTI-aware synthesis of digital circuits

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

  • Affiliations:
  • University of Minnesota;University of Minnesota;University of Minnesota

  • Venue:
  • Proceedings of the 44th annual Design Automation Conference
  • Year:
  • 2007

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Abstract

Negative Bias Temperature Instability (NBTI) in PMOS transistors has become a major reliability concern in nanometer scale design, causing the temporal degradation of the threshold voltage of the PMOS transistors, and the delay of digital circuits. A novel method to characterize the delay of every gate in the standard cell library, as a function of the signal probability of each of its inputs, is developed. Accordingly, a technology mapping technique that incorporates the NBTI stress and recovery effects, in order to ensure optimal performance of the circuit, during its entire life-time, is presented. Our technique, demonstrated over 65nm benchmarks shows an average of 10% area recovery, and 12% power savings, as against a pessimistic method that assumes constant stress on all PMOS transistors in the design.