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Difference between pnoisemethod=default and pnoisemethod=fullspectrum?

charlieWu

Hello everyone,

I ask a question here last week and get great help , and I  have another question after simulating. I read the guideline "Using Spectre RF Analyses for Non-RF Circuits", which is shown as below:

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000009ESBAUA4&pageName=ArticleContent

page 20 of the note says "Select fullspectrum method. This option eliminates the need to tune the maxsidebands option", but simulation results are the same no matter that I use pnoisemethod=default or pnoisemethod=fullspectrum.

I did another test that giving different "maxsideband"(based on noisefmax setting in transient noise simulation) value when I use "pnoisemethod=fullspectrum", and output integrated noise will become larger when I give a bigger maxsideband(it makes sense to me).

I can't find the description about the relationship between "fullspectrum method" and  "maxsideband" in spectre manual.

My question is simple: Should I use "pnoisemethod=fullspectrum"?  I think it is more reasonable for me that ignoring  pnoisemethod=fullspectrum and  give an appropriate maxsideband now.

Thanks

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