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Maximizing PSS simulation accuracy in presence ... (Read 14427 times)

schehrazi

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University of CA, LA

Re: Maximizing PSS simulation accuracy in presence
Reply #15 - Mar 30^th, 2007, 10:21am

Another update for those interested in this thread:

I talked to somebody from Cadence a few minutes ago, this issue is not related to different versions of Cadence. It was his mistake last time, he read the result of the shooting method simulation instead of harmonic balance in his simulation. That's why he thought it was working with the previous ISR.

The key to make this work is to use a HUGE number of harmonics. I thought 200 was already a lot but he suggested to increase it to 1024 and now, the results well match! I am amazed why I should use that huge number of harmonics though!

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Ken Kundert

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Silicon Valley

Re: Maximizing PSS simulation accuracy in presence
Reply #16 - Mar 30^th, 2007, 1:39pm

This is a risk with all harmonic balance simulators. In many circumstances they require a large number of harmonics and to date none of them automatically set the number of harmonics to control error.

Shame on them. Spice has had automatic error control for 35 years, and there is no reason why it cannot be provided with harmonic balance. Personally, as a user, I think you should be outraged and let Cadence know that you are disappointed in them.

-Ken

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BERBEREPHONE Junior Member Offline Posts: 15	Re: Maximizing PSS simulation accuracy in presence Reply #17 - Apr 5^th, 2007, 2:18pm Hi , There is someone who knows a way to measure IIP3 and compression point 1db under ELDO for an MIXER in a AC analysis or SST analysis?? Thanks a lot, ecrivez moi les commandes a utiliser pour calculer 1db compression point ibrdmmache
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