[SI-LIST] Re: Differential S-parameters
- From: mmunroe <mmunroe@xxxxxxxxxxxxxx>
- To: "Dima Smolyansky" <Dima@xxxxxxxxxxxxxx>
- Date: Fri, 11 Jan 2002 21:25:48 -0500
Dear Dima,
I will call your attention to page 18 of the DesignCon 2002 program
available on the web. http://www.designcon.com/2002/catalog.pdf
http://www.atspeedtechnologies.com/
"HP-TF1 Monday, January 28 9:00 am - Noon
High-Performance System Design Conference
"Measurement-Based Design Series: Re-Examining the New Limits for High
Speed on Copper
"Henri Merkelo, Chief Executive Officer, Ultrahigh Speed Electronics,
atSpeed Technologies
Timothy Hochberg, Technical Staff, atSpeed Technologies in collaboration
with ERNI Components
and Agilent Technologies."
I cannot understand what your basis is for impugning my honesty. For you=
r
information, ERNI Components, Inc
has been funding a significant portion of Dr. Merkelo's research for the
past year. We are paying his
airfare, hotel and meals so that he can present information relating to t=
he
high speed characterization of
interconnect systems at DesignCon 2002. =
In addition, his method of extracting S21 was validated in his two papers=
last year one which was co-authored
by Agilent and one that was co-authored by Compaq Computers. In the two
DesignCon papers just mentioned,
this method was compared to the following methods:
VNA with balun to 2 Gigahertz
ATN Microwave 4001 to 6 Gigahertz
TDT Extraction to 10 Gigahertz (what I am referring to)
ATN Microwave 4002 to 20 Gigahertz
If you are going to cast aspersions on the technical veracity of my
comments, please
back up your casual "pot shots" in some way that will advance the
understanding of
the subscribers to this reflector.
Here are the titles of the papers that were given:
DesignCon 2001: HP-09A "Broadband Measurements in the Differential Mode"
Accurate Determination of Dispersive Attenuation. T. Hochberg, H. Merkelo=
,
J. Grebemkemper, G. Kimitsuka, D. Vermeersch.
DesignCon 2001: HP-05: "Advances in High-Speed Design in Dispersively
Attenuating environments Such as Cables and Backplanes. T. Hochberg, H.
Merkelo, M. Resso.
I am sure we would all be more interested in comments that would address
the subject in a more useful way. I believe that the additional ability =
of
the Oculus (tm software) to be able to convert import direct VNA
measurements in Agilent Touchstone (tm) format and export composite
circuits from Oculus in Agilent Touchstone (tm) format make this a
particularly useful method that lends itself to a rigorous examination. =
The ability to reproduce actual measurements taken with an Agilent 86100
Digital Scope and an Anritsu Pulse Generator, within the Oculus-Cascade
workbench with mathematical modeling based on measurement based models wi=
ll
be interesting to those attending the TechForum session on Monday January=
28th. =
We look forward to your questions at that time.
http://www.atspeedtechnologies.com/
michael munroe =
TeamZD Coordinator
The ERNI Group "A Copper Alliance Partner."
Chester, Virginia
804-240-7188
www.teamZD.com
www.erni.com
Message text written by "Dima Smolyansky"
>Hello,
I think one important part that this author is missing is that Pat Zabins=
ki
was asking for "true" differential S-parameters measurement, not conversi=
on
of single-ended measurements into differential. Henri Merkelo's software
would not be accurate as "true" differential S-parameter computation, sin=
ce
it is based on not true differential initial data, but conversion of
single-ended into differential. Also, since Patrick seem to be interested=
in
non-linear active (active is the key word) device characterization, in th=
is
case getting S-parameters from TDR does not seem to be the best thing, as=
TDR has not been widely used for active device characterization. We come
across these questions about TDR all the time, and people believe it may =
be
possible to do active device characterization with a DC blocking capacito=
r,
but nobody seems to have done it.
Another important (although non-technical) point that the author is missi=
ng
is that it is inappropriate to mislead this newsgroup. None of DesignCon
forums or papers is sponsored by anybody - at least not any more than any=
technical paper at a technical conference can be - they can only be
co-authored. I know this because we have a TecForum and a paper at
DesignCon
ourselves (and our paper and TecForum will deal with exactly some of the
technical issues analyzed above). Furthermore, ERNI is nowhere on
DesignCon co-sponsor and nobody from ERNI is on a co-author list, to the
best of my knowledge. I hope Mr. Monroe just mis-spoke accidentally.
Thanks,
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Dima Smolyansky
Time Domain Analysis Systems, Inc.
11140 SW Barbur Blvd., Suite 100
Portland, OR 97219
(503) 246-2272
(503) 246-2282 (fax)
(503) 804-7171 (mobile)<
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