[SI-LIST] Re: Signal crossing Split plane

  • From: "Jean-Pierre Maurice" <mauricejeanpierre@xxxxxxxxxxxxxx>
  • To: shlepnev@xxxxxxxxxxxxx, Chris.Cheng@xxxxxxxx, ch_harrington@xxxxxxxxx
  • Date: Sun, 2 Dec 2007 01:28:18 +0100

Yuriy,
stop confusing yourself and others with lengthy emails and explanations that
have no proof.

Which of the references you quote in the 40s or any other EM principle
warrants you to model discontinuities the way you do in your application
notes? I went through all the examples in your website using the link you
provided (http://www.simberian.com/AppNotes.php) and realized that you don't
have even one example where you correlated your simulations with
measurements. Why? Are you hiding something?

At the beginning, Lee advised you to do some measurements. Charles also said
the very thing, but in a rather harder way.

I may disagree with the way Charles pointed this out to you, but there is a
lot of truth in everything he said, especially regarding your models.
Indeed, the models in your application notes are not correct and also
misleading, I would say. You make terrible claims about your solver's
ability to compute complex multilayer geometries and yet provide no example
to make your case solid.

In the case of via-hole modeling; If you have now learned and agree that
via-holes are not just barrels and pads as you represent them in your notes,
and if you now also agree that you need to be far away with your ports, then
why do you still have these unrealistic models in your application notes?
You even go as far as posting them in this list. By doing so, you mislead
the young and unexperienced. You even mislead the users of your solver. If
you claim that any of the models (multilayer geometries, slots, via, planes,
transmission lines, etc) in your application notes is correct, then show us
how they match with measurement results.

There are also a lot of weakness in the way you explain some fundamental
issues which do not reflect the 25 years of experience you claim to have.
Unlike Charles, I will not talk about that openly in this forum. May be
privately, if you permit me. You even forge explanations to justify your
solver and models. This is inappropriate.

I am now on holidays. When I get back to work, I would like to evaluate your
solver using some of our multilayer geometries (if you provide me the 3 day
evaluation license you promise on your website). As long as I don't see any
good correlation with measurements and your simulation models are also weak,
then there is no way I can believe you.

Chris: I don't think Yuriy is the person to ask questions concerning real
PCB designs when he can not provide realistic examples in the application
notes of his own solver. If you don't believe me, use the link given above.
Charles too is a bit impolite, I would say. There are a lot of other well
respected experts in this forum (Steve, Istvan, Lee, Eric Bogatin etc) from
whom I learn a lot. I think they will give you real answers, not some theory
that does not help.

Best regards
Jean Pierre


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