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ATLAS User’s Manual 17.6.1: Recommendations And Defaults It is not normally required to specify any initial guess parameter. The INITIAL parameter is normally used only to obtain a thermal equilibrium solution. The PREVIOUS, PROJECT, LOCAL, and MLOCAL parameters are used for other bias points. PREVIOUS and PROJECTION are the most frequently used. PROJECTION is normally preferred to PREVIOUS when it is available (i.e., when there are two previous solutions differing in the bias applied to the appropriate terminal). PREVIOUS is required for transient simulations, and for simulations that use current boundary conditions. LOCAL and MLOCAL tend to work well for reverse-biased devices, and are especially efficient when trying to increase very large voltage increments. By default, PROJECTION is used whenever two appropriate solutions are available. Otherwise, the PREVIOUS guess is used, unless there is no previous solution, in which case INITIAL is used. 17-18 SILVACO International
