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