[SI-LIST] Re: Coupled & Lossy Line Model Validation Structure

Hi julian

This is wonderful news.

1.   There is a lot of confusion about Frequency domain and Time domain 
models of
       lossy lines and it is great that you have made measurements as 
well as investigated
       the various simulation models and simulation tools including 
S-Parameters.
2.   It is also very encouraging that after all your hard work you have 
elected to share
       this information with the engineering community.
3.     Lastly, it is great that you are trying to open the door to an 
open forum so that others
       may contribute as well.

Good work, and I hope that we may at some time collaborate.

Ron Miller

Julian Ferry wrote:

>A few months back, I mentioned that we at Samtec were working on a paper
>about lossy line models.  We're still not completely finished, but we have
>some initial segments ready. They are available on our website now.
> 
>The first part discusses a reference structure which we have been using for
>a few years for validating models and simulations. We have built the
>structure (which we call the Golden Standard) physically, and have used it
>to investigate and validate new test procedures.  We have found the Golden
>Standard to be so useful, that we thought other SI Engineers might be
>interested as well.  Its not rocket science, but we figured, why force
>people to re-invent the wheel?
> 
>The structure is a basic, 2 line micro strip PCB.  Analytical solutions
>exist for several key loss and coupling parameters. Those solutions make
>great markers for comparing with simulated data.  I should also note that
>the Golden Standard demonstrates the infamous "anomalous" insertion loss
>resonance effect that pops up here on the list from time to time.
> 
>The first part of the paper gives an overview of the structure. It includes
>data obtained from 2D and 3D solvers, and measured data from Agilent's PLTS
>system and TDA Systems IConnect TDR data post processor.  The second part of
>the paper gives a theoretical discussion on the derivation of the analytical
>solutions.  
> 
>We have analyzed the Golden Standard using just about every modeling and
>simulation tool at our disposal. We have built models using several 2 D and
>3 D solvers, used the models to generate spice and S-parameter models that
>we have run in Berkeley SPICE, HSPICE, and PSPICE, we have generated models
>from physical measurements using the Agilent PLTS and TDA Systems software,
>looked at single ended and differential simulations and measurements, in the
>time and frequency domains.  So far we have about 75 pages of data. We will
>eventually be posting this data on our website. We still have quite a few
>simulations to go, and plan to continue to add to the list over time.
> 
>We are considering opening up the data base so that other users can post
>results there too. We haven't worked out the logistics for that yet. But if
>anyone is interested in something like that, please send an email to
>goldenstandard@xxxxxxxxxxx  We could host that on our website, or possibly
>set it up in relation to the SI list archive pages in someway.
> 
>In the mean time, the papers are available on our website at:
> 
>http://www.samtec.com/signal_integrity/golden_standards/goldenstandard_part1
>.pdf
><http://www.samtec.com/signal_integrity/golden_standards/goldenstandard_part
>1.pdf> 
> 
>http://www.samtec.com/signal_integrity/golden_standards/goldenstandard_part2
>.pdf
><http://www.samtec.com/signal_integrity/golden_standards/goldenstandard_part
>2.pdf> 
> 
>Or you can go to www.samtec.com <http://www.samtec.com/> , hit the "Signal
>Integrity" Tab, and hit "Golden Standard" from there.
> 
>A description of the cross section is there, along with the analytical
>values, so it's a pretty easy process to set up and run some quick
>validations of your current processes.  We should soon have a .dwg cross
>section file posted there too, which you might be able to paste directly
>into your software.
> 
>In addition, we have fabbed some sample boards complete with SMA attachment
>points.  These boards are great for validating test procedures and 3D solver
>solutions.  We will have 40-50 on hand to give away at DesignCon next week,
>so stop by our booth if you're interested. We will also be making them
>available from our website in the next few weeks. If you would like to
>request a kit when they become available, send your contact information to
>goldenstandard@xxxxxxxxxx <mailto:goldenstandard@xxxxxxxxxx> .
> 
>Thanks.
> 
>Julian Ferry
>High Speed Engineering Manager
>Samtec, Inc
>Mechanicsburg, PA
> 
> 
> 
>
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-- 
Ronald Miller
Ghz Data, Signal Integrity Consulting
7721 Sunset Ave.
Newark CA  94560
tel     510-793-4744
cell    510-377-9380
fax     510-742-6686
www.ghzdata.com

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