Andrew Beckett
Senior Fellow
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Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
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Well, your question is a bit light on details. Try (assuming you're using IC5141 or later) setting the highorder=yes option on the PSS options form to enable the Multi Interval Chebychev method - which should reduce the numerical noise if the oscillator is quite linear. See if that makes a difference (I'm not sure it will, but I wanted to ensure that what you're seeing is not related to numerical accuracy in the PSS).
Regards,
Andrew.
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