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[SI-LIST] Re: Question on 2D field solver
- From: Chris Cheng <Chris.Cheng@xxxxxxxxxxxx>
- To: "'Raj Raghuram '" <raj.raghuram@xxxxxxxxxxxxxxx>, "'ray.anderson@xxxxxxxxxx '" <ray.anderson@xxxxxxxxxx>
- Date: Thu, 11 Nov 2004 14:51:17 -0800
I doubt the Grover close form equations are frequency dependent.
-----Original Message-----
From: Raj Raghuram
To: ray.anderson@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Sent: 11/11/2004 8:54 AM
Subject: [SI-LIST] Re: Question on 2D field solver
Ray,
2D field solvers usually leave out the internal inductance and
inductance formulas include them. Could this be the difference? Does
MMTL produce a frequency dependent inductance?
Best Regards,
On Wed, 2004-11-10 at 23:24, Raymond Anderson wrote:
> Here's a question for the field solver guru's on the list:
>
> I'm currently taking a critical look at the Mayo MMTL BEM 2D field
> solver (TNT 1.2.2) that the developers at Mayo have so graciously made
> freely available under the GNU GPL to the world. See the si-list
> message announcing it for download links:
> (http://www.freelists.org/archives/si-list/07-2004/msg00311.html)
>
> In preparation for doing a series of simulations on some via
geometries
> in packages I decided to validate the accuracy of the MMTL program on
> some simple geometries that independent high accuracy answers were
known
> for.
>
> I first tried the zero thickness stripline benchmark suggested by Dr.
> Rautio at Sonnet Software.
> (http://www.sonnetusa.com/products/benchmarking/eval_ch3.asp). The
> results were about -0.4% low at 49.8002 ohms. This compares
> comparably with a selection of other solvers I've had access to (but
on
> the low end of the range).
>
> Mayo MTTL 49.8002
> Polar CITS25 49.96
> Agilent Appcad 3.0.2 49.8
> AWR TXLINE 50.0346
> LINPAR 2.0 50.03
> LINPAR 1.0 50.027
>
> Next I selected the case of a pair of parallel round elements as a
test
> case. The analytical solution for the inductance of this geometry is
> given by Grover in chapter 5 of "Inductance Calculations". His formula
> is an analytic solution based on first principles.
>
> Using a test case of conductors 150 microns in diameter on a 500
> micron pitch, Grover's equations yields a loop inductance of
> 758.84797 nH for 1 meter long conductors. The same problem modeled in
> the MMTL field solver gives an answer of 749.4645 nH. I'm trying
to
> understand why the field solver answer is about 1.2% low. Is this
> reasonable for a 2D MOM BEM solver using quasi-TEM assumptions? I've
> tried modeling it several ways (as a pair of parallel circular
> conductors far from ground and as a single circular conductor with
it's
> image reflected across a ground plane) and am getting the same answer
> out to at least 2 decimal places. I've also tried upping the density
of
> the meshing with little real improvement.
>
> Comments, suggestions and ideas solicited. Thanks!
>
> -Ray Anderson
>
> Senior Signal Integrity Staff Engineer
> Advanced Packaging R&D
> Xilinx Inc.
>
>
>
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--
Raj Raghuram
Berkeley Design Automation (http://www.berkeley-da.com)
2902 Stender Way
Santa Clara, CA-95054-3213
Tel: 408.496.6600 x203
Cel: 408.390.7614
Fax: 408.496.6633
email: raj.raghuram@xxxxxxxxxxxxxxx
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