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Statistic Analysis of Power/Ground Networks Using Single-Node SOR Method

In this paper, we propose an efficient statistical analysis method for analyzing on-chip power grids. The new method, called SN-SOR (and its faster version, PSN- SOR), is based on a novel localized relaxed iterative approach and it can perform variational analysis on one node at a time. PSN-SOR further speeds up the analysis by using a refined conditioner, where the initial solution of SN-SOR is used as the pre-conditioner for the later iterations. Experimental results show that PSN-SOR is about two orders of magnitude(186X) faster than Monte- Carlo method with slight errors less than 5.685% on maximum and is about one order magnitude (41X) faster than general global successive over relaxation (SOR) method. PSN-SOR is more accurate and efficient than the recently proposed random walk method for localized statistical analysis.