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Saving operating point in Transient (Read 3694 times)

parth_sv

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Saving operating point in Transient
Feb 28^th, 2008, 5:45am

Hi All,
I need to do noise analysis on a circuit whose response is quite dynamic. For this purpose i need to save the operating point of the entire circuit at a given time in transient run and use this as 'ic or nodeset' in noise analysis. While its quite easy in hspice, how can I do this in spectre(ADE) (Unfortunately I dont have access to hspice -:( )?

Thanks in Advance

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achim.graupner

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Re: Saving operating point in Transient
Reply #1 - Feb 28^th, 2008, 6:39am

Hi there,

well the most simplest solution is using the final operating point.
In Cadence ADE this option is "hided" is in the Setup->Simulation->Transient->Option.

As far as I remember you need to do an DC op before the noise analysis, as in noise analysis nodeset has been or still is not supported.

To change the analysis order (to have dc before noise) in ADE it is Setup->Environment->Simulation Order, just use spectre syntax there.

Hope that helps,
Regards,Achim

Achim Graupner
ZMD AG, Dresden, Silicon Saxony, Germany

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John O Donovan Junior Member Offline Posts: 29 San Jose, CA	Re: Saving operating point in Transient Reply #2 - Feb 28^th, 2008, 9:05am Do a spectre -h tran, and look at the parameters actimes and acnames. These allow you to run a set of AC type analyses, including noise at particular times during the transient analysis. I think that there are equivalent fields in the ADE interface but don't have ADE up to check. Regards, John
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parth_sv New Member Offline Posts: 6	Re: Saving operating point in Transient Reply #3 - Feb 29^th, 2008, 5:01am Hi John, Thanks - got it. Need to specify acnames and actimes - time when i want to run noise
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