[SI-LIST] Re: SSN
- From: Julia Nekrylova <fialka113@xxxxxxxxx>
- To: elie issa <eliaissa1@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 24 Oct 2011 22:36:23 -0700 (PDT)
Elie,
crosstalk and SSN might add up, or they might partially cancel out. You have to
run simulation analysis to know for sure.
Under SSN (classical definition) we understand such phenomena as "ground
bounce" and "power sag", i.e. L*di/dt noise which involves power/ground
networks.
Under crosstalk we understand inductive and capacitive coupling that involves
signal/return paths.
In some SI teams it is usual to include crosstalk under the broader definition
of "SSN" which might be confusing.
Inductive crosstalk would add to SSN whereas capacitive crosstalk would be of
the opposite sign with respect to SSN. Since almost all package/board level
xtalk is rather inductive, in most cases, these 2 signal degradation mechanisms
would add up reducing your noise margins.
Just my 2 cents.
Thanks,
Julia
74ze
From: elie issa <eliaissa1@xxxxxxxxx>
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Sent: Friday, October 21, 2011 9:12 AM
Subject: [SI-LIST] Re: SSN
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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