RE: [SI-LIST] : Analytical formula of characteristci impedance fo r microstrip andstripline

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From: Willis, Ken (Ken.Willis@sycamorenet.com)
Date: Tue May 22 2001 - 05:43:47 PDT


Hi Brian,

I remember going through this some years back when I was at
Cadence and we were initially integrating the field solver.
I believe the answer to your question is "Dielectric I".

Ken

-----Original Message-----
From: Wang, Brian [mailto:brian.wang@intel.com]
Sent: Monday, May 21, 2001 7:24 PM
To: 'Scott McMorrow'
Cc: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : Analytical formula of characteristci impedance
fo r microstrip andstripline

Scott and Steve,

Thank you.

My next question is related to the model:

--------------------------------
  Dielectric I
--------------------------------
 * Region | Trace | * Region
--------------------------------

  Dielectric II
---------------------------------

What material is used in the * regions?
Or upper half part in the * regions is as same as Dielectric I,
and lower half as same as Dielectric II?

Any comments?

Brian

-----Original Message-----
From: Scott McMorrow [mailto:scott@vasthorizons.com]
Sent: Monday, May 21, 2001 3:46 PM
To: Wang, Brian
Cc: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : Analytical formula of characteristci impedance
for microstrip andstripline

Brian,

SpectraQuest does not use analytical formulas. It uses
a numerical field solver to calculate RLGC matrices, from
which characteristic impedance and propagation delay
are calculated from. It uses the Boundary Element Method
which is quite fast and reasonably accurate for most
2D structures.

If you go to the SpectraQuest help dialog and search
for "field solver" you will find a bit more information.

regards,

scott

"Wang, Brian" wrote:

> Hi,
>
> I'd like to know what analytical formulas used in SpecctraQuest
> to have characteristci impedance and propagation delay.
> Welcome to advice on this issue. Thanks.
>
> Brian
>
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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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