[SI-LIST] Re: AW: fiber weave effect
- From: "Yuriy Shlepnev" <shlepnev@xxxxxxxxxxxxx>
- To: <Gert.Havermann@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 15 Aug 2014 08:38:27 -0700
Hi Gert,
Thank you for the comment. This was not so obvious for me when we have
started the investigation. The spacing between the trace pairs and pitch
between the pairs was carefully adjusted to be able to run one trace of one
the pairs over mostly humps and another trace mostly over the valleys. Also,
3313 with the flattened fabric is not so homogeneous as follows from the
investigation done for exactly the same material in the reference [17] of
our paper (it was basically the starting point in our investigation).
If tight coupling indeed reduces the FWE, it makes all other mitigation
techniques (from [3] and [8] for instance) applicable only for the loosely
or uncoupled pairs. This is one more significant advantage for the tight
coupling that apparently was not mentioned before. Obviously, the meaning of
"tight" requires quantification in this context with the voltage coupling
coefficient for instance.
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA
Office +1-702-876-2882; Fax +1-702-482-7903
Cell +1-206-409-2368; Virtual +1-408-627-7706
Skype: shlepnev
www.simberian.com
Simbeor Accurate, Fast, Easy and Affordable Electromagnetic Signal
Integrity Software
2010 and 2011 DesignVision Award Winner
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Havermann, Gert
Sent: Friday, August 15, 2014 7:35 AM
To: shlepnev@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AW: fiber weave effect
Hello Yuriy,
I'm not surprised that tight coupling is less attracted to weave effect on
3313 glass.
Mechanically spoken, tighter coupling decreases the dielectric differences
in between traces of a differential pair. Look at Figure 5 of your paper and
imagine what the difference of effective dielectric surrounding the traces
would be when the spacing is close to one tracewidth. The difference would
be very small, especially when flat weave or even flattened weave is used.
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Yuriy Shlepnev
Gesendet: Freitag, 15. August 2014 16:08
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] fiber weave effect
Hello Everyone,
Some results of our on-going investigation of fiber-weave effect (FWE) were
recently presented at IEEE EMC 2014 symposium (at SIPI section) and the
paper and presentation are now available at
http://www.simberian.com/AppNotes.php - see #2014_04.
One of the interesting outcomes was practically negligible FEW impact on the
tightly coupled traces on spread fiber fabric (voltage coupling coefficient
about 0.2). We have observed it both on strip and micro-strip (one sheet of
dielectric fabric) configurations.
We did not find any published confirmation of this result. Any comments or
thoughts?
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA Office +1-702-876-2882; Fax
+1-702-482-7903 Cell +1-206-409-2368; Virtual +1-408-627-7706
Skype: shlepnev
www.simberian.com
Simbeor - Accurate, Fast, Easy and Affordable Electromagnetic Signal
Integrity Software
2010 and 2011 DesignVision Award Winner
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