oermens wrote on Dec 2nd, 2008, 9:56am:sorry if this has been covered before, i searched but did not find an answer.
If you read Cadence Spectre documents surely, you can find all answers to your questions easilly.
oermens wrote on Dec 2nd, 2008, 9:56am:pss:
Beat frequency: 2.4G
If you use Shooting Newton PSS, you have to set fundamental frequency lesser than actual steady state oscillation frequency.
oermens wrote on Dec 2nd, 2008, 9:56am:pss:
Accuracy: Conservative
You should set Accuracy=Moderate in your first simulation.
With Accuracy=Conservative, you might encounter convergence problem in PSS.
oermens wrote on Dec 2nd, 2008, 9:56am:pss:
oscillator node: Vo+
reference node: Vo- (is this correct or should be /gnd! ?)
You had better set reference node as Vo-.
But even though you set reference node as /gnd!, there is no problem.
oermens wrote on Dec 2nd, 2008, 9:56am:pnoise:
sweeptype: default
Relative harmonic: blank (should be 1?)
When master PSS analysis is autonomous, sweeptype is relative and Relative harmonic=1 by your setting. This is implicit setting.
If you are still worried, you may set sweeptype=relative and Relative harmonic=1 clearly.
oermens wrote on Dec 2nd, 2008, 9:56am:pnoise:
Positive output node: Vo+
Negative output node: Vo- (again, is this correct?)
You had better set Negative output node as Vo-.
But even though you set Negative output node as /gnd!, phase noise results is not changed if you set reference node as Vo- in pss setting.
oermens wrote on Dec 2nd, 2008, 9:56am:I didnt change any of the additional options for pss/pnoise. If someone could validate or correct my settings, it would be appreciated.
Basically there is no critical problem in your settings.
http://www.designers-guide.org/Forum/YaBB.pl?num=1223659963/0#1