[SI-LIST] Fw: Re: SSN

  • From: elie issa <eliaissa1@xxxxxxxxx>
  • To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Sun, 4 Mar 2012 11:44:08 -0800 (PST)

Here is another private reply, which could be interest.  I don't think Scott 
would mind me sharing! 
Neither, on the first line, should have been "in either" or "both", as the rest 
of the reply detailed!
I like to think this topic and its replies generated some interesting topics of 
discussions later!
----- Forwarded Message -----
From: elie issa <eliaissa1@xxxxxxxxx>
To: Scott McMorrow <scott@xxxxxxxxxxxxx> 
Sent: Friday, October 21, 2011 9:50:53 AM
Subject: Re: [SI-LIST] Re: SSN


We may be in conflict about terminology, crosstalk clearly saturates neither in 
near and far end, 
while its saturation at near end dependent on the critical length, calculated 
from rise time and two unites time delay, far end saturates when the even and 
odd modes components separates, in a non homogeneous environment.  I am talking 
here about the rise noise voltages at the ground and power lines saturation, 
which are not linear, can saturate and reverse

From: Scott McMorrow <scott@xxxxxxxxxxxx>
To: elie issa <eliaissa1@xxxxxxxxx>
Sent: Friday, October 21, 2011 12:31:12 PM
Subject: Re: [SI-LIST] Re: SSN


Elie

I would debate your statement "we know".    If SSN is defined to be the 
summation of crosstalk from all sources, plus SSO voltage rail collapse of the 
drivers as a result of multiple drivers switching, then saturation of crosstalk 
against a victim occurs only as the result of increasingly large spatial 
distances, and  SSO voltage rail collapse saturates only as a result of 
decreasing driver di/dt as the entire voltage rail collapses. 

Cumulative sum of crosstalk reaches an asymptote, and does not reverse.
SSO can only reduce when voltage rail collapse feedback into the drivers causes 
a reduction in gain.

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 
On 10/21/2011 12:12 PM, elie issa wrote: 
It looks like my second line got clipped:
We know that SSN saturates after switching a certain number of outputs, based 
on the relation N*L*di/dt, and 
starts a reverse process,..
 
From: elie issa <eliaissa1@xxxxxxxxx> To: "si-list@xxxxxxxxxxxxx" 
<si-list@xxxxxxxxxxxxx> Sent: Friday, October 21, 2011 11:50:37 AM
Subject: SSN I'd like tp propose this topic:
we know that SSN staurates after switching a certain number of outputs, and 
start 
could someone elaborate on the reasoning behind the saturation, and  are there
designed applications taking advantage of this aspect of it out there
Also, system crosstalk worsen because of package parameters, so beside 
crosstalk at package level, ssn also contribute to crosstalk,  could 
some explain what happens there? 

Thank you
Elie
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  • » [SI-LIST] Fw: Re: SSN - elie issa