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Simulators >> Circuit Simulators >> spectre.ic versus spectre.ic
https://designers-guide.org/forum/YaBB.pl?num=1201680625

Message started by trond on Jan 30^th, 2008, 12:10am

Title: spectre.ic versus spectre.ic
Post by trond on Jan 30^th, 2008, 12:10am

Hello,

I would like to use the initial conditions of a previous transient analysis to speed up other transient runs by reading in all node conditions. I was wondering which of the two files to use, spectre.ic or spectre.fc? I would assume the .fc would be more correct as written last?

Thanks

Title: Re: spectre.ic versus spectre.ic
Post by ywguo on Jan 30^th, 2008, 8:14pm

Hi trond,

I guess the spectre.fc is the node voltages ( branch current of voltage source) at the last time point. It depends on your purpose to choose spectre.ic or spectre.fc. Use spectre.ic to save the time spending in solve the DC operation point. Use spectre.fc to avoid to run a transient simulation which costs too much CPU time to make the circuitry into normal operation mode. For eg., it is annoying to wait the reference voltage settling when I simulate ADC. However, I don't know the data accuracy in spectre.fc is enough to make the transient simulation resume. It is interesting, I will try.

BTW, I don't think the .fc is more correct because that depends on the tolerances for DC and tran analysis.

Yawei