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- W2136328167 abstract "Process variations are of increasing concern in today's technologies, and they can significantly affect circuit performance. An efficient statistical timing analysis algorithm that predicts the probability distribution of the circuit delay considering both inter-die and intra-die variations, while accounting for the effects of spatial correlations of intra-die parameter variations, is presented. The procedure uses a first-order Taylor series expansion to approximate the gate and interconnect delays. Next, principal component analysis (PCA) techniques are employed to transform the set of correlated parameters into an uncorrelated set. The statistical timing computation is then easily performed with a program evaluation and review technique (PERT)-like circuit graph traversal. The run time of this algorithm is linear in the number of gates and interconnects, as well as the number of varying parameters and grid partitions that are used to model spatial correlations. The accuracy of the method is verified with Monte Carlo (MC) simulation. On average, for the 100 nm technology, the errors of mean and standard deviation (SD) values computed by the proposed method are 1.06% and -4.34%, respectively, and the errors of predicting the 99% and 1% confidence point are -2.46% and -0.99%, respectively. A testcase with about 17 800 gates was solved in about 500 s, with high accuracy as compared to an MC simulation that required more than 15 h." @default.
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- W2136328167 date "2005-09-01" @default.
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- W2136328167 title "Statistical timing analysis under spatial correlations" @default.
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- W2136328167 doi "https://doi.org/10.1109/tcad.2005.850834" @default.
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