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Simulating with AC Coupling

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Can anyone advise a SigNoise novice the best way to simulate multi-gig signals which are AC coupled ? The problem I have is that if I run at the resolution I need to examine the signals at, it takes an age for the caps to charge so that the signal levels are within the normal operating range. Ideally I either want to be able to simulate very coarsely for a period, then change the res, or perhaps I could force the initial voltage on the caps somehow ? Cant do any of this manually (per simulation), as I have a LOT of such signals to sim in batch mode. I would prefer not to modify either the design or the device models if possible


Please forgive if this is a dumb question, or the answer is blindingly obvious (or both) !


Originally posted in cdnusers.org by aball
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  • Donald has a good point. Messing around with initial conditions can be really time consuming. It is better to remove the cap and just add the parasitics. Do an analysis on the lowest frequency your data rate and encoding will create and make sure the capacitor value is large enough to not cause any issues.


    Originally posted in cdnusers.org by Kalevi2
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  • Donald has a good point. Messing around with initial conditions can be really time consuming. It is better to remove the cap and just add the parasitics. Do an analysis on the lowest frequency your data rate and encoding will create and make sure the capacitor value is large enough to not cause any issues.


    Originally posted in cdnusers.org by Kalevi2
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