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Temperature- and Voltage-Aware Timing Analysis

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4 Author(s)
Lasbouygues, B. ; STMicroelectronics, Crolles ; Wilson, R. ; Azemard, N. ; Maurine, P.

In the nanometer era, the physical verification of a CMOS digital circuit becomes a long, tedious, and complex task. Designers must indeed account for numerous new factors that impose a drastic change in validation and physical-verification methods. One of these major changes in timing verification to handle process variation lies in the progressive development of statistical static-timing engines. However, the statistical approach cannot capture accurately the deterministic variations of both the voltage and temperature variations. Therefore, we define a novel method, based on nonlinear-derating coefficients, to account for these environmental variations. Based on temperature- and voltage-drop computer-aided-design tool reports, this method allows computing the propagation delay of logical paths considering the operating conditions of each cell. As the statistical timing analysis does, the proposed approach reduces design margins compared to worst/best case corner analysis with fixed voltage and temperature values, a gain of 10% on the delay has been observed for critical paths

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:26 ,  Issue: 4 )