Y Z
Guest
|
Martin,
This was fixed more than half year ago. In that fix, the PSS convergence for oscillators was improved, and the sweep won't fail if one in it does.
The fix was done for version 4.4.6 and all the later release. If you can find the following message after the tstab integration (the first transient integration) "The Estimaged Oscillating Frequency from Tstab Tran is ... (Hz)", then you are using the fixed release. Otherwise, you should update your Spectre.
If you do have those messages and your sweep still fails, please report it to Cadence. We are very interested to fix your problem.
>The only thing i notice that is wierd is that when the >second and subsequent pss analyses run in the >sweep, they use the frequency from the previous pss > run as the guessed fundamental in the current run.
Yes. the previous converged period is used as guess period for the current run. But for each run, Spectre does a tstab integration from 0 to tstab+4*guess_period, and estimates a more accurate period from the tstab integration.
YZ
|