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I was discussing the pros and cons of using Spice as an analytical tool with some analog-design engineers at a recent conference. The consensus was that vendors have improved their implementation of Spice such that the program is now usable for any engineer who can check out the dc conditions. The biggest problems that Spice analysis has faced and still incurs are the models. Spice vendors don't verify the performance of IC models; they may ensure that a series of models functions with their program, but they never check accuracy.