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Simulators >> RF Simulators >> PNOISE QVCO
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Message started by hrkhari on Dec 18^th, 2005, 5:54pm

Title: PNOISE QVCO
Post by hrkhari on Dec 18^th, 2005, 5:54pm

Hi:

When I execute the PNOISE and PSS analysis in determining the phase noise of the QVCO designed, the plot is not displayed, whereas an error indication says:

"Output nodes of pnoise analysis not saved for pss analysis. As a result, the above selected function cannot be executed."

I had done the same procedure in determining the phase noise of a LC-tuned VCO, where there is no problem in executing the phase noise plot. But when I configure the QVCO from the VCO topology the phase noise execution fails. Pls do guide me in obtaining the Phase Noise Plot. Thanks in advance

Rgds

Title: Re: PNOISE QVCO
Post by Andrew Beckett on Dec 22^nd, 2005, 2:02pm

I've seen this problem caused by having the names of the nodes where you're measuring the noise having unusual characters in them (e.g. the "+" and "-" characters) - this was fixed a while back though. What are the names of the two nodes that you're measuring the noise at? It may also have happened if they are getting mapped at all...

Also, check the pss results in the results browser to see if the nodes are present in the results - it needs this to divide the output noise by the magnitude of the oscillator 1st harmonic.

Regards,

Andrew.