[SI-LIST] Re: Phase jitter vs. period jitter

Hello 

 In time domain , we usually take TIE jitter as phase jitter . It determines 
the ideal clock frequency by measuring the frequency of all the cycles in your 
waveform and taking the average of all the measurements. Or you just enter the 
value for the ideal clock frequency manually . Once the ideal clock frequency 
is determined, all of the cycles of your waveform are compared to the ideal 
clock frequency and the error statistics are computed.

The period measurement is defined as the time between the middle threshold 
crossings of two consecutive, like-polarity edges. 

The cycle-to-cycle jitter measurement measures the period of the first cycle of 
the waveform and subtracts it from the period of the second cycle of the 
waveform for the first measurement result. Then, the second cycle of the 
waveform is measured and subtracted from the third cycle period for the second 
measurement result. This operation continues until all of the cycles of the 
waveform have been measured. 

 In many cases , the jitter differences between input and output are caused by 
channel/media (ISI) , crosstalk/coupling to the channel/media .  
Crosstalk/coupling can contribute as PJ . If PJ jitter is originated at 
transmitter side , not by channel/media , we won't find much difference at 
input/output .

 There is one phase noise analyzer which is customized for clock jitter 
analysis . You may find more details at 
http://cp.literature.agilent.com/litweb/pdf/5989-5131EN.pdf  
http://cp.literature.agilent.com/litweb/pdf/5989-0906EN.pdf    

  I also list some other jitter related articles for your reference : 
Jitter Analysis Techniques for High Data Rates  Application Note 1432
    http://cp.literature.agilent.com/litweb/pdf/5988-8425EN.pdf  
Measuring Jitter in Digital Systems Application Note 1448-1
    http://cp.literature.agilent.com/litweb/pdf/5988-9109EN.pdf   
Advanced Jitter Generation and Analysis up to 3.35 Gbps with the Agilent 81134A 
Pulse Pattern Generator & 86100C Infiniium Wide-Bandwidth DCA-J Oscilloscope
    Product Note http://cp.literature.agilent.com/litweb/pdf/5989-1650ENDE.pdf  
HDMI(tm) Compliant Jitter Tolerance Test Solution for Cable and RX Test with 
ParBERT 81250 http://cp.literature.agilent.com/litweb/pdf/5989-4959EN.pdf  
7 Hints for Making Innovative Signal Source Measurements in Wireless RF Design 
and Verification Using the Signal Source Analyzer
    http://cp.literature.agilent.com/litweb/pdf/5989-1618EN.pdf 
Finding Sources of Jitter with Real-Time Jitter Analysis
   http://cp.literature.agilFent.com/litweb/pdf/5988-9740EN.pdf  
Agilent Technologies EZJIT and EZJIT Plus Jitter Analysis Software for 
Infiniium Series Oscilloscopes datasheet
   http://cp.literature.agilent.com/litweb/pdf/5989-0109EN.pdf  
Selecting RJ Bandwidth in EZJIT Plus Software
   http://cp.literature.agilent.com/litweb/pdf/5989-5056EN.pdf  
Choosing the ISI Filter Size for EZJIT Plus Arbitrary Data  Jitter Analysis 
   http://cp.literature.agilent.com/litweb/pdf/5989-4974EN.pdf  
Analyzing Jitter Using Agilent EZJIT Plus Software AN1563
   http://cp.literature.agilent.com/litweb/pdf/5989-3776EN.pdf  
Calibrated Jitter, Jitter Tolerance Test and Jitter Laboratory with the Agilent 
J-BERT N4903A
   http://cp.literature.agilent.com/litweb/pdf/5989-4967EN.pdf  
Precision Jitter Analysis Using the Agilent 86100C DCA-J
    Product Note 86100C-1 
http://cp.literature.agilent.com/litweb/pdf/5989-1146EN.pdf 

Regards
Jiwei Du
Digital Design Test PLM

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Jai Shanker
Sent: 2006年8月24日 23:31
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Phase jitter vs. period jitter

Hello,

I am evaluating 2 clock drivers for a project from
different manufacturers and found that one specified
phase jitter in ps, (RMS) and the other period jitter
in ps, RMS. 

The spec for phase jitter was not phase noise or in
dBc/Hz. It helpfully adds that the cycle-cycle jitter
on its input will equal the output, the part wont add
jitter.

I searched SI-list and couldnt find much info. Could
somebody help provide some tips on how they compare/
correlate.

I did get some complex discussion involving
convolution and integrals. If it can only be
understood at that level (rather beyond me :-)) pls
let me know. 

I am now studying a Corning apnote on VCXO phase
jitter  that is reasonably OK, but would appreciate
any tips.

Thanks & regards,
Jai Shanker W.
ACI Pvt Ltd


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