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Weibull based analytical waveform model

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3 Author(s)
Amin, C.S. ; Dept. of Electr. & Comput. Eng., Northwestern Univ., Evanston, IL, USA ; Dartu, F. ; Ismail, Y.I.

Current CMOS technologies are characterized by interconnect lines with increased relative resistance w.r.t. driver output resistance. Designs generate signal waveshapes that are very difficult to model using a single parameter model such as the transition time. In this paper, we present a simple and robust two-parameter analytical expression for waveform modeling based on the Weibull cumulative distribution function. The Weibull model accurately captures the variety of waveshapes without introducing significant runtime overhead and produces results with less than 5% error. We also present a fast and simple algorithm to convert waveforms obtained by circuit simulation to the Weibull model. A methodology for characterizing gates for the new model is also presented. Simulation results for many single and multiple input gates show errors well below 5%. Our model can be used in a mixed environment where some signals may still be characterized by a single parameter.

Published in:

Computer Aided Design, 2003. ICCAD-2003. International Conference on

Date of Conference:

9-13 Nov. 2003

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