[SI-LIST] Re: HSpice field-solver syntax for trapezoidal stripline pair

Hi Agathon,

Where in the stack should the conductors be located?  From the conductor
coordinates given in your model, the conductors are embedded in the
ground plane.

.MODEL ...
...
+ CONDUCTOR=3D(ORIGIN=3D(0 0)      MATERIAL=3Dcopper SHAPE=3Dtrace)
+ CONDUCTOR=3D(ORIGIN=3D(255.6u 0) MATERIAL=3Dcopper SHAPE=3Dtrace)

All conductor locations should have the y dimension greater than 0.

Tracy Barclay
CAE
Synopsys, Inc.
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of agathon
Sent: Tuesday, October 30, 2007 16:25
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] HSpice field-solver syntax for trapezoidal stripline
pair

Greetings,
Now that I'm being subjected to the #(@&!!!?$@$# !  HSpice field solver,
could someone have mercy on me and straighten me out?  Solvnet is too
busy
handling the geometric increase in user issues.

I've googled and have the Synopsys manual, all of which either aren't
clear
or (in the case of synopsys) tell absolutely nothing.
I'm confident the only issue is the SHAPE and ORIGIN numbers in the deck
below.  The design is asymm. stripline.

MANY THANKS.... Somebody needs to take away Synopsys' ice cream cone,
for
sure.

I use the following deck below and get an error, using ver2007.09 :

 IR2D: 2D field solver for magnetic coupling effect
 IR2D: setup
 IR2D: Setting Matrix
 Error:Maximum Number of GMRES iterations reached: 500   residue: nan
>error          ***** hspice job aborted


design...
trace sep =3D 355.6micron
trace width =3D 120.65/133.35  (trapez. 0.5mil factor)
trace thickness =3D 15.24micron (0.6mil)
stack...
0.6mil plane - top
3.9mil prereg
14mil core
0.6mil sig
3.9mil prereg
0.6mil plane

The deck below generates the RLGC table file.
 ----------------------------------------------------------------------

.Title    100ohm asymm diff stripline -- field solver

Wfs_diffstrip_asymm_rough in1 in2 0 out1 out2 0  N=3D2 l=3D1
+ FSmodel=3Ddiffstrip_asymm_rough
+ PRINTZO=3DLIN 64 0 1.5625g
+ MIXEDMODE=3D1

.FSOPTIONS fsopt accuracy=3Dhigh printdata=3Dyes computegd=3Dyes
computers=3Diter
+ computego=3Dyes computero=3Dyes computetable=3DLIN 64 0 1.5625g
.SHAPE trace POLYGON VERTEX=3D(
+ 100u 114.3u 112.7u 99.06u 220.65u 99.06u 233.35u 114.3u)

.MATERIAL copper  METAL               CONDUCTIVITY=3D59.6meg =
roughness=3D2u
.MATERIAL prepreg DIELECTRIC ER=3D3.31  LOSSTANGENT=3D0.012
.MATERIAL core    DIELECTRIC ER=3D4.07  LOSSTANGENT=3D0.012
.LAYERSTACK stack1
+ LAYER=3D(copper,15.24u)
+ LAYER=3D(prepreg,99.06u)
+ LAYER=3D(core,355.6u)
+ LAYER=3D(prepreg,99.06u)
+ LAYER=3D(copper,15.24u)
.MODEL diffstrip_asymm_rough W MODELTYPE=3DFieldSolver
+ FSOPTIONS=3Dfsopt RLGCFILE=3Ddiffstrip_asymm_rough.rlgc
+ LAYERSTACK=3Dstack1
+ CONDUCTOR=3D(ORIGIN=3D(0 0)      MATERIAL=3Dcopper SHAPE=3Dtrace)
+ CONDUCTOR=3D(ORIGIN=3D(255.6u 0) MATERIAL=3Dcopper SHAPE=3Dtrace)
.end
------------------------------------------------------------------------
----------------------------


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