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Empirically characterized equation- and table-based cell models have been applied in static timing analysis for decades. These models have been extended to handle a variety of environmental and circuit phenomena over the years. This has given rise to a profusion of cell models that are used to verify circuit functionality and performance. The recent invention of a second-generation of current source models shows the promise of a unified electrical cell model that comprehensively addresses most of the effects that are perceived as accuracy limiters. In this paper, we describe these accuracy limiters and present comprehensive results for a particular current source model .