The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Sep 17th, 2024, 4:27pm
Pages: 1
Send Topic Print
Regarding Jitter. (Read 2296 times)
smarty
Community Member
***
Offline



Posts: 46

Regarding Jitter.
Jun 06th, 2007, 7:04am
 
Hi all,
  I have a basic question relating to Data dependant jitter. Its a combination of ISI, DCD and other effects.
I see that to remove the ISI effect and evaluate DCD, provide a 101010.. pattern. Is it the correct method by which the DCD can be calculated.

Also Can anybody suggest, how can the DCD measured in terms of time. What I know till now is DCD is the variation  of duty cycle
from the normal value and can be measured in %(50% ideal) ( pls. correct me if my understanding is wrong). So if I need to know the DCD
in terms of time, how can  that be done?.

Is there any paper, which gives me some good ideas regading the various jitter and its effects?.

One more in the same context. How can we evaluate various jitter from the Eye diagram?. Can anybody suggest any paper relating to this.

Thanks and Regards,
SBR
Back to top
 
 
View Profile smarty smarty   IP Logged
mg777
Senior Member
****
Offline



Posts: 131

Re: Regarding Jitter.
Reply #1 - Jun 6th, 2007, 8:28am
 

Jitter due to ISI and DCD are invariably mixed up - both can give rise to dual Dirac pdf's, and you worry about deconvolving these only if you're selling jitter analyzers. The 1010... technique usually works for DCD, while the more sophisticated analysis techniques operate in the spectral domain.

M.G.Rajan
www.eecalc.com


Back to top
 
 
View Profile   IP Logged
smarty
Community Member
***
Offline



Posts: 46

Re: Regarding Jitter.
Reply #2 - Jun 6th, 2007, 10:31am
 
Hi Rajan,
  Thanks for your inputs.

Actually I planned to run spectre simulations to estimate the DCD.
So in order to eliminate the other other effect , I thought it would be best to give a 101010.. pattern
and estimate the DCD at the output.

Can DCD be estimated from the eye diagram?. Could you kindly clarify one query of mine.

when we plot the eye diagram for  te data pattern, We see a bunch of transition forming eye.
What will be the jitter that would be corresponding to this bunch?. Is this the peak-to-peak jitter or any other
jitter?.

Thanks and Regards,
S.Baanurathan
Back to top
 
 
View Profile smarty smarty   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2024 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.