Is the issue of "positive phase noise" related to MMSIM version?

Dear Tawna,

Thanks a lot for the reply. The server manager is trying to figure out if he installed MMSIM11.1 correctly. We will contact customer support if he think it is needed. 

Best regards,

bjbit 

By the way, the reason that "lorentzian" doesn't show up on the pnoise options form is that you're using too old an IC version. I can tell from the graph appearance that you're definitely using IC614 or earlier. You didn't say the precise version but the fact that you were also using MMSIM60 suggests to me that it was a very old version. 

You really should update to something newer. You could just type in lorentzian=yes in the additional parameters field on the pnoise options form, but it's highly likely that there are other fixes that could be important too - so my recommendation would be to update to IC616 (latest hotfix) first - and ideally MMSIM131 - before contacting customer support if you still have an issue.

Andrew 

Dear Andrew,

You are right. It is IC614 I am using. My server manager showed me the content of the Cadence setup file, and it does show MMSIM version is 11.1, although he is not 100% sure it works correctly. So probably it is the old version of IC which fails to be compatible to the new "lorentzian" option? I will let him know your recommendation and try to update to a newer version. Thanks a lot for your information and time.

Best regards,

bjbit 

Dear Andrew,

Sorry I bring this topic back. I finally got IC615+MMSIM11.1 which is the latest version my server manager can get from his current license. Now I have the "lorentzian" option to use, and got the phase noise and jitter plot as shown in the attachment. The red curve, related to the left Y axis, is plotted from "directly plot" -> "pnoise" -> "phase noise", which flattens the "non physical" data in low offset frequency. The green curve,  related to the right Y axis, is plotted from "directly plot" -> "pnoise jitter" -> "phase noise", and it seems the "lorentzian" method is disabled here. Then I get the same issue on the jitter calculation (jc). For only one cycle, the jitter results from different start integration frequency is not much. But with a long term, the jitter calculation gives very different results. 

Please let me know if I need to submit a support request. It takes time since I have to go through my server manager for the account. Thanks a lot for your time.

Best regards,

bjbit 

Please contact customer support. Sorry if that's more work for you - I'm pretty tied up this week. 

Regards,

Andrew 

Understood. Thanks.

Best regards,

bjbit 

Dear Andrew,

Sorry that I bring this topic back again. My server manager forwarded my question to the customer support many days ago, but still get no feedback so far. I don't know if it is common case of the long processing period. If it is not, is it possible that you could help to forward this issue? It is not supposed to let me know the account ID, but it is from Virginia Tech University ECE department for tracking. Please let me know if any concerns. Thanks for your time.

Best regards,

bjbit 

Hi bjbit,

I looked in the call tracking system and did not see any Cases for Virginia Tech Univ. with the subject of positive phase noise (I only looked within the past year).  

If a Case is not getting proper attention, you (your server manager or whomever owns the case) can have it escalated through http://support.cadence.com .  I recommend that course of action.  

best regards,

Tawna

Dear Tawna,

Thanks for your quick response. I don't actually know how my server manager submit the case. I think I will go to him to have a check together.

Best regards,

bjbit