The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> RF Simulators >> PSS Error - V(Out) is too small to reliably detect the period of the oscillator
https://designers-guide.org/forum/YaBB.pl?num=1222966819

Message started by tkhan on Oct 2^nd, 2008, 10:00am

Title: PSS Error - V(Out) is too small to reliably detect the period of the oscillator
Post by tkhan on Oct 2^nd, 2008, 10:00am

Hi, I have recently started getting this error when running PSS:

"V(out) is too small to reliably detect the period of the
oscillator. This may be because nodes with insignificant signal levels
were chosen, or it may be because the oscillator was never properly
started."

I can resolve it by changing the initial guess of the fundamental frequency (even by 1MHz) but I don't understand why? There is an initial condition on this node to start the oscillation and transient starts ok. Any insight would be appreciated as I am not too familiar with how the PSS simulator actually works...

Title: Re: PSS Error - V(Out) is too small to reliably detect the period of the oscillator
Post by Andrew Beckett on Jan 3^rd, 2009, 3:24pm

It may be that the oscillation dies out - if you ran a long enough transient. Or it may be that it really isn't starting up properly.

Did you try saving the initial transient (there's a checkbox on the PSS form for this) and taking a look at how it is behaving during the initial transient? Or what happens if you run a very long transient - does it die out?

Andrew.