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SpectreRF: Can we force no pss iterations? Or just take the 1st one

Hi,

pss is great e.g. also because of its sweep capabilities and powerful output measurement options. However, sometimes the pss iterations bother and take much time to execute. Is there a way to shut off the iterations? I think of a simple amplifier or comparator or latch. Here usually the tran sim is already very close to the steady state. I could use the initial tran run only, but this way I would still waste time with iterations, and I cannot use the powerful measurements like P1dB, spectrum output, etc.

Bye Stephan

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Frank Wiedmann over 3 years ago

You can use the steadyratio parameter to fake pss convergence (which is usually not a good idea, as Andrew mentioned).
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Frank Wiedmann over 3 years ago

You can use the steadyratio parameter to fake pss convergence (which is usually not a good idea, as Andrew mentioned).
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ShawnLogan over 3 years ago in reply to Frank Wiedmann

Dear StephanWeber,

I was about to respond this morning when I saw Frank's response - which was exactly what I was going to suggest - both Frank and Andrew are way ahead of me as usual!

Just to provide a bit more information concerning Frank's response if it is useful...

From Andrew's comment StephanWeber, you probably know this already for which I apologize. However, for others who might view this post, the convergence criteria and the parameters that impact PSS convergence are provided in the RF Analysis Assembler/Explorer User Guide (21.1) at URL:

https://support.cadence.com/apex/techpubDocViewerPage?path=spectreRFinExplorer/spectreRFinExplorer21.1/Chap4.html#pss_analysis

where it states:

Hence, you might consider relaxing your simulation accuracy requirements "very carefully" as a possible means of reducing the number of iterations to achieve PSS convergence. However, achieving your goal may result in simulation errors that are not tolerable in your application.

Shawn
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