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

bjbit

Hi,

 I am simulating PSS+Pnoise on my LC oscillator for jc and jcc jitter measurement. From the phase noise plot I got positive value at low frequency offset, which I think makes the jitter calculation incorrect. I searched and read through some old threads with the same topic. It seems this issue is connected to the MMSIM version, but nobody clarified it. I am likely working with IC61+MMSIM60, although I need to check with the server manager. So is it the case that if I upgrade MMSIM, this issue "positive phase noise" can be solved? Or is there anything else I am missing? Thanks in advance.

Regards, 

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  • 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 

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  • 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 

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