RE: [SI-LIST] : XTK multiboard simulation using amp spice connect or models....... ..

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From: Mckinley, Jory (Jory.Mckinley@compaq.com)
Date: Thu Dec 02 1999 - 13:56:14 PST


Hello Scott,
Yes a simple LC network is not appropriate for most if not all MLM
connectors but it will give a very very crude first approximation. A more
complete picture would be to have the artwork for the MLM connector in a
board format like Allegro (PADS,Mentor,..). From this board file one can
create with a layup the necessary coupled TL model for XTK simulations. The
TL model can be included into XTK as a multi-board.
The non-ideal return currents and power/ground noise can be modeled with AC
grade but this is not included in the general XTK software.
I hope this helps,
-Jory

Jory McKinley
Consulting Engineer
ph: (508)624-7103
e-mail: jory.mckinley@compaq.com

-----Original Message-----
From: Scott McMorrow [mailto:scott@vasthorizons.com]
Sent: Thursday, December 02, 1999 4:06 PM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : XTK multiboard simulation using amp spice
connector models....... ..

Syed,

Does this also work with coupled MLM connector models. It seems
to me that in this case a lumped LC is not enough.

I also do not believe that XTK will handle the non-ideal return paths
correctly, will it? Nor the noise induced into ground and power pins.

regards,

scott

Syed Huq wrote:

> Michael,
>
> This multi-board sim is quite easy to setup in XTK. You can use TOPSPEC to
> define any connector via a lumped LC.(See example in Ch6 of 'Preparing PCB
> database for simulation with TLC/XTK/QUIET' or Ch7 of XTK users manual)
>
> Then use a hdf and con file to define the hierarchy of boards connecting
> to each other and the 'mapping' of the connections(con file). This con
file
> describes how the nets get tied across the connector.(See examples in Ch7
of
> 'Preparing PCB database for simulation with TLC/XTK/QUIET').
>
> Then follow the translation process and it's a piece of cake.
>
> % tmp -hdf <design>.hdf
> % isf2xtk -hdf <design>.hdf
>
> Regards,
> Syed
> Cisco Systems, Inc
>
> >
> > Hello SI List,
> >
> > I am continuing my investigation of XTK and have run into
> > a bit of a road block that I thought you might be able to help me with.
> > I have a desire to perform a multi-board system simulation where my
> > board to board interconnect is a standard 2 mm HM connector that
> > is used and supported by lots of folks. I have an AMP MLM for the
> > connector and would prefer not to fill my day modifying spice decks.
> > My feedback from folks to date has been that 'ya can't get there from
> > here', unless of course I would like to re-write the model myself for
> > use within XTK.
> >
> > I know that alot of folks in telecom are using this connector
> > and are probably using XTK. What are my options? Any good?
> > Thanks for the help.
> >
> > Best Regards,
> >
> > Michael Greim
>
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--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com

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