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https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> Transient Simulation issue https://designers-guide.org/forum/YaBB.pl?num=1280434484 Message started by purplewolf on Jul 29th, 2010, 1:14pm |
Title: Transient Simulation issue Post by purplewolf on Jul 29th, 2010, 1:14pm I have a transient simulation for 100ns..it took about 10 minutes.. I wonder whether 1) the behaviour in first 20ns is related to the transient state of the circuit and spectre is trying to converge 2)After 20ns Spectre converges and find the steady state solution.. Am i thinking in the right direction? Should i ignore whatever happens in the first 20ns and consider trust the waveforms aound let say 80ns or 90ns?? I also wonder whether is unstability in the circuit?? |
Title: Re: Transient Simulation issue Post by sheldon on Jul 29th, 2010, 9:14pm Purplewolf, Don't think that it is a convergence issue, just think it takes a little time to settle. Try an experiment, save the transient state at 100ns, then restart the simulation from 100ns and run to 200ns and see if the results are stable. Best Regards, Sheldon |
Title: Re: Transient Simulation issue Post by pancho_hideboo on Aug 7th, 2010, 9:57pm purplewolf wrote on Jul 29th, 2010, 1:14pm:
You have to verify it by various methods. http://www.designers-guide.org/Forum/YaBB.pl?num=1243078889 http://www.designers-guide.org/Forum/YaBB.pl?num=1234428781/7#7 http://www.designers-guide.org/Forum/YaBB.pl?num=1218635777/5#5 http://www.designers-guide.org/Forum/YaBB.pl?num=1255834027/14#14 http://www.designers-guide.org/Forum/YaBB.pl?num=1268385779/1#1 |
Title: Re: Transient Simulation issue Post by purplewolf on Aug 10th, 2010, 3:23am in the first 20ns... also sometimes the current or voltage waveform is amplitude modulated..is that indicationb of low frequency instability as device has lots of gain and stability issues at low frequency... i wonder if its possible to get an idea of stability issues from the transient simulation apart from circles and k factor.. |
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