[SI-LIST] Re: Jitter transfer vs. accumulation

May be we need to clear up the terminology/definitions.
By RMS jitter I think George is referring to RJ rms or the 1-sigma value 
of the gaussian. This I think is bounded as George has repeatedly stated.
The peak-peak RJ of course is unbounded and depends on the number of 
samples. I think George has referred to this as phase jitter.

Comments from Steve and Alfred seemed to suggest that the RJ rms, the 
1-sigma of the gaussian itself is unbounded.
Steve, Alfred could you please clarify if that is what you meant/observe?

Thanks,
Vinu



Scott McMorrow wrote:

>George
>
>I have a quick question.  You said:
>
>"The VCO RMS jitter is bounded, and so is the PLL RMS jitter.  The RJ
>distribution takes on a true Gaussian waveform."
>
>My meager understanding of this is that Rj is by definition unbounded. And the 
>presence of a true Gaussian distribution (when all other deterministic 
>components have been subtracted out) is an indication of this unboundedness. 
>And yes, theoretically it will approach infinity at infinite time. However, 
>because the random component is so low, it "seems" to be bounded within a 
>specific BER confidence level.  Which is why we have repeatability in 
>measurements.  My contention is that Rj is much smaller than most people 
>believe or are able to measure, and that it is low probability deterministic 
>noise components that dominate the jitter spectrum. Unfortunately, these can 
>also tend to have near-gaussian distributions, mucking up the measurement 
>apparatus.
>
>If what I say above is correct, then what you describe above is truly 
>unbounded jitter, taking on a Gaussian distribution.
>
>Do you agree?
>
>
>best regards,
>
>Scott
>
>
>
>
>Scott McMorrow
>Teraspeed Consulting Group LLC
>121 North River Drive
>Narragansett, RI 02882
>(401) 284-1827 Business
>(401) 284-1840 Fax
>
>http://www.teraspeed.com
>
>Teraspeed® is the registered service mark of
>Teraspeed Consulting Group LLC
>
>
>  
>
>>  
>>    
>>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>http://www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
>List technical documents are available at:
>                http://www.si-list.net
>
>List archives are viewable at:     
>               http://www.freelists.org/archives/si-list
>or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
>Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>  
>
>  
>



------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: