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https://designers-guide.org/forum/YaBB.pl Measurements >> Phase Noise and Jitter Measurements >> PNoise : No crossing events detected for Jitter Calculations https://designers-guide.org/forum/YaBB.pl?num=1247757067 Message started by rajat on Jul 16th, 2009, 8:10am |
Title: PNoise : No crossing events detected for Jitter Calculations Post by rajat on Jul 16th, 2009, 8:10am Hello everyone, I have been trying to calculate Jitter of a MM-Divider using PSS+PNoise analysis in SpectreRF. But, after the PSS analysis runs through successfully (at least I hope so), I get the following error during PNoise analysis. PNoise analysis : No crossing events detected for Jitter Calculations. I have no clue as to why this happens, as I can see the PSS solution converging within 3 iterations with the PSS-transient analysis results as shown in the attached pic. The threshold is set to 2.4 V and as can be seen is clearly being crossed. The MMD is based on CML. And I have the following settings for the analysis: PSS - Beat Frequency = 50M (the divided output frequency) No of Harmonics = 7 Accuracy Defaults : I tried with both conservative & moderate, but without success. tstab = 200 ns PNoise - Sweep Type = relative Relative Harmonic = 1 Sweep Range = 100Hz - 25 MHz Sweep type = Logarithmic, Points per decade = 7 Max Sideband = 30 Output = \out & \outn, as I have the inverted divided signal also available Input Source = none Noise Type : Jitter Threshold Value : 2.4 V Crossing Dir = Rise I would really appreciate some help on this. Thanks in advance & Regards |
Title: Re: PNoise : No crossing events detected for Jitter Calculations Post by Ken Kundert on Jul 16th, 2009, 8:26am Since you are monitoring a differential signal, shouldn't the threshold be 0? Why are you using a relative sweep in PNoise? -Ken |
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