[SI-LIST] Re: Single ended Noise OR Differential Noise

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Tue, 07 Oct 2014 12:14:38 -0700

All voltage noise between a single-ended transmitter and receiver causes 
jitter.  Single ended jitter is minimized by:  Launching against a 
single reference, propagating the transmit energy against that same 
reference, and tightly coupling the receiver threshold voltage to that 
same reference.

Steve.

On 10/7/2014 6:10 AM, Naresh Dhamija wrote:
> Hi folks,
>
> I am doing power noise analysis on a system that uses SSTL IO buffers. I
> am seeing the ripple on the IO output signal - such that during hi state
> IO output signal follows the noise whatever is on the vddio and during low
> state, IO output signal follows the noise on the vss. Observing this
> phenomenon, I purposely forced IN PHASE single ended noise  to both vdddio
> and vss of almost the same frequency as of data rate but uncorrelated with
> data rate. Since noise forced to vddio and vss are IN PHASE so
> Differential Noise measured between vddio and vss at each instant shows
> zero noise. But still I see jitter on the edges because of finite rise and
> fall times, the initial low level and final high level for a transition
> from low to hi are not always same. Does this mean that along with
> differential noise, single ended noise on power and ground also cause
> jitter to IO driver.
>
> Regards
> Naresh
> ------------------------------------------------------------------
> 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 forum  is accessible at:
>                 http://tech.groups.yahoo.com/group/si-list
>
> List archives are viewable at:
>               http://www.freelists.org/archives/si-list
>   
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>    
>
>


-- 
Steve Weir
IPBLOX, LLC
1580 Grand Point Way
MS 34689
Reno, NV  89523-9998
www.ipblox.com

(775) 299-4236 Business
(866) 675-4630 Toll-free
(707) 780-1951 Fax

All contents Copyright (c)2013 IPBLOX, LLC.  All Rights Reserved.
This e-mail may contain confidential material.
If you are not the intended recipient, please destroy all records
and notify the sender.

------------------------------------------------------------------
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 forum  is accessible at:
               http://tech.groups.yahoo.com/group/si-list

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  

Other related posts: