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Simulators >> Circuit Simulators >> Transient Sensitivity in Spectre
https://designers-guide.org/forum/YaBB.pl?num=1204308006

Message started by Christoph on Feb 29^th, 2008, 10:00am

Title: Transient Sensitivity in Spectre
Post by Christoph on Feb 29^th, 2008, 10:00am

Dear All!

Why is there no tranisent sensitivity in spectre? I've made a delay measurement with spectreMDL and want to find the sensitivity of this delay to some circuit parameters. Is this possible in spectre?

Thanx!

Christoph

Title: Re: Transient Sensitivity in Spectre
Post by Stefan on Mar 1^st, 2008, 2:35am

I don't think that there is something like "transient sensitivity".
You could do a transient simulation, save the operating point at a desired time and then use an ac (sensitivity) analysis.

Title: Re: Transient Sensitivity in Spectre
Post by thechopper on Mar 5^th, 2008, 6:02pm

Hi Christoph,

Actually worst casing for transient simulation is somehow a "transient sensitivity" analysis. You should be able to change your model parameters and see the effect on the transient analysis, in particular in the delay you are interested in.

Tosei.

Title: Re: Transient Sensitivity in Spectre
Post by Christoph on Mar 5^th, 2008, 11:26pm

Hi!

Thank you all for your answers. Changing parameters by hand would work but is rather inefficient when there are many parameters. An adjoint sensitivity calculation would be good.

Anyway, thanks for your help.

Kind regards,
Christoph

Title: Re: Transient Sensitivity in Spectre
Post by thechopper on Mar 7^th, 2008, 5:36pm

Hi,

You could still save some time if you run your transient analysis with an ocean script. You should write one in which you run each transient analysis for the set of values for each parameters you would like to change.

Hope this helps
Tosei