Dear Yuriy,
As you said: "The foil manufacturers may provide some mechanical
data that are not relevant to the electrical behavior of copper"
I'm extracting 25Gbps differential traces by ANSYS HFSS, I'm confused how
to choose the suitable roughness model of traces.
What are the parameters or specification which we can base on that? I need
to cover the worst case of losses due to surface roughness.
Thanks.
VÃ o Th 5, 14 thg 3, 2019 vaÌo luÌc 06:49 Yuriy Shlepnev <
shlepnev@xxxxxxxxxxxxx> Äã viết:
Hi Dan,
Meg6 was used in the analysis to measurement validation project EvR-1 - the
results were reported last year at DesignCon 2018 - see #2018_01 and
#2018_07 at http://www.simberian.com/AppNotes.php Complete solutions for
the
material model identification and automation scripts for that project are
available on request.
Meg7 was extensively studied in another project with the results reported
at
DesignCon 2019 - see #2019_01 at http://www.simberian.com/AppNotes.php The
goal in this project was to build statistical models for dielectric itself
and for the conductor roughness.
Note, that in both cases the identified Dk and Df were close to the data
provided by manufacturer. However, the actual traces exhibited much larger
losses due to the conductor surface roughness. The board manufacturers in
both studies did not have any numbers for the electrical characterization
of
the copper roughness. The foil manufacturers may provide some mechanical
data that are not relevant to the electrical behavior of copper. In
addition, the copper is also treated by the board manufacturer - there were
no data on this process either. Any guess in such case would be better than
nothing, but if you want accurate characterization and comparison, you have
to do the model identification with the measurements.
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
2629 Townsgate Rd., Suite #235, Westlake Village, CA 91361, 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, Productive and Cost-Effective Electromagnetic Signal
Integrity Software to Design Predictable Interconnects!
2010 and 2011 DesignVision Award Winner, 2015 Best In Design&Test Finalist
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
Behalf Of Dan Bostan (Redacted sender "dbostan" for DMARC)
Sent: Wednesday, March 13, 2019 11:27 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Megtron6 vs. Megtron 7 vs. Isola MT40
Does anyone have direct experience with all of those materials, for designs
above 32Gbaud?I used successfully Megtron6 in the past, but I am looking
for
alternatives.Any pricing information would be appreciated, as
well.Cheers,Dan Bostan
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