Amit Goel
ABSTRACT
Increasing variability in the manufacturing process and growing complexity of the integrated circuits has given rise to many design and verification challenges. Statistical analysis of circuits and current source based gate delay models have started to replace the conventional static timing analysis which uses lookup tables for gate delays. In this paper we develop a statistical current source based gate model. We use accurate analytical models for representing the parameters of the gate model as functions of process parameters. Using the proposed statistical gate model, the gate output signal is generated and modeled as process dependent variational waveform. We present a compact model for representation of the variational signal waveform. The proposed waveform model can accurately generate the signal waveform at any process corner for accurate timing analysis. We generated the prosed model for gates of a 90nm industry library and validated with SPICE simulations. Our model for logic gates and variational waveforms showed very good correlation with SPICE. The maximum error across all validation experiments was close to 3%.
- CCS Timing White Paper, synopsys inc.Google Scholar
- C. S. Amin, F. Dartu, and Y. I. Ismail. Weibull based analytical waveform model. In ICCAD, 2003. Google ScholarDigital Library
- S. Bhardwaj, P. Ghanta, and S. Vrudhula. A framework for statistical timing analysis using non-linear delay and slew models. In ICCAD, 2006. Google ScholarDigital Library
- E. Dartu, N. Menezes, and L. Pilegg. Performance computation for precharacterized cmos gates with rc-loads. In IEEE Transactions on CAD, vol. 15, 1996. Google ScholarDigital Library
- A. R. et al. Accurate waveform modeling using singular value decomposition with applications to timing analysis. In DAC, 2007.Google Scholar
- H. Fatemi, S. Nazarian, and M. Pedram. Statistical logic cell delay analysis using a current-based model. In DAC '06: Proceedings of the 43rd annual conference on Design automation, 2006. Google ScholarDigital Library
- R. G. Ghanem and P. Spanos. Stochastic Finite Elements: A Spectral Approach. Springer-Verlag, 1991. Google ScholarDigital Library
- A. Goel and S. Vrudhula. Current source based standard cell model for accurate signal integrity and timing analysis. In Proceedings of the Design Automation and Test in Europe Conference (DATE), 2008. Google ScholarDigital Library
- A. Korshak. An effective current source cell model for vdsm delay calculation. In ISQED, 2001. Google ScholarDigital Library
- B. Liu. Gate level statistical simulation based on parameterized models for process and signal variations. In ISQED '07: Proceedings of the 8th International Symposium on Quality Electronic Design, 2007. Google ScholarDigital Library
Index Terms
- Statistical waveform and current source based standard cell models for accurate timing analysis
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