Hoi Dana, On Sun, 22 Oct 2017 09:23:26 -0500 Dana Whitlow <k8yumdoo...@gmail.com> wrote:
> But I am surprised about the simulation times that you speak of. > Would you be willing to post some information detailing your > methodology and an example "simple" circuit? As Bruce already mentioned, the simulation times required for getting decent results is 100-1000 times as long as the lowest frequency considered. This is basically a statistical issue as noise simulation, to be accurate, has to average over several "runs" to remove effects of the noise source behaviour. Another thing is, that, for the transient simulation to be accurate, the maximum steps size has to be limited such that the maximum voltage or current step seen is small. Ie if there is anything in the system with high slew rates, then the step size has to be adapted to this slew rate. This in turn makes it slower Additionally, most spice implementations have quite short running random number generators (usually with a state space of 2^16 to 2^32, few with 2^64) which in turn requires some tricks to get decent results out of it, that again make the simulation time longer. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.