Phase noise from transient: PN function

From a very quick look, the PN function with the method set to "Absolute Jitter Method" is essentially equivalent to the expression shown above, assuming of course you pick the same crossing type, window, window size etc.

There's no need to turn on multiple runs to estimate the jitter; that's only if you want to get a few samples to see how sensitive it is to random variation between runs.

Thanks Andrew,

this is significant time saving! Does it figure out the jitter in the background then, even if you've got that switch off?

Thanks,

Maurizio

maaz2020 said:

this is significant time saving! Does it figure out the jitter in the background then, even if you've got that switch off?

I'm not sure I understand your question. The jitter is computed from the random variation you get over time with noise sources enabled during the transient - it then computes the absolute jitter and does a psd of the result. I'm not sure what is "in the background" about this, but I don't see how you came to the conclusion that the multiple runs would be needed; that simply runs several times but varies the seed between runs to get a different random sequence. In general with transient noise, if you are averaging noise-related effects over a long time, you can either run a long simulation or run multiple shorter simulations in parallel. I'm not sure that's particularly relevant in this case though.

Dear maaz2020,

maaz2020 said:

is the PN function equivalent to what described in the document "Jee Measurement Using PSS/Pnoise and Transient Noise Analysis: RAK" (p.33):

You may be interested in a note I assembled concerning this document in a Dropbox link at the Forum post

https://community.cadence.com/cadence_technology_forums/f/rf-design/56894/jee-measurement/1389211#1389211

As a result of the effort, I submitted a number of potential comments and corrections to Cadence. Part I of the note at URL:

provides a summary of the potential corrections and comments. To avoid the spam filter, I included the link as a graphic. To allow you to access the link more easily if you are interested, copy and append: "www.", "dropbox.com" and the following text string to create the link for a browser.

/s/3m531dl4fl7bwbr/jee_computation_example_sml_032823v1p0.pdf?dl=0

Shawn