Hi ShawnLogan, Thanks a lot for these clear explanations! I am simulating a clocking circuit containing huge time constants (AC couplings) that takes ages to stabilize; and I need a very accurate stabilization as I am measuring delays of a couple of picoseconds; furthermore there is a lot of calculation noise before a long simulation time. [quote userid="383860" url="~/cadence_technology_forums/f/custom-ic-design/43225/spectre-multiple-dynamic-parameters/1364700#1364700"]I have a lot of experience with simulations of stiff differential equations, and do not personally find adjusting the accuracy parameters of the simulation as the simulation progresses an efficient means of approaching the steady-state solution faster. With some details about the type of circuit you are tackling, skylink, perhaps I , or the many experts who monitor the forum, might provide some alternatives. Of course, if you would prefer to contact customer support, as Andrew also suggested, that is fine too.[/quote] You are right, I have finally decided to keep the same conservative setting as I saw the "step" you mention, and this does not help at all. Thanks again, bye
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