[SI-LIST] HSPICE Field Solver

Guys,

I am running HSPICE 2001.2 to do SI work on a Backplane. Unfortunately the
field solver within HSPICE is giving me suspect results. Here is the code
that I am using for my W element setup:

___________________________________________________
* Track shape definiton widths to suit

.SHAPE rect RECTANGLE WIDTH=0.0001016m, HEIGHT=0.00001778m,

* Preliminary layer stack

.LAYERSTACK stack_1,
+LAYER=(PEC,0.00001778m), LAYER=(getek,0.000381m),
+LAYER=(PEC,0.00001778m)

* Setting field solver options to high accuracy

.FSOPTIONS opt1_1 GRIDFACTOR=3 PRINTDATA=YES 
+ComputeRo=yes ComputeRs=yes ComputeGo=yes ComputeGd=yes

*-----------------------------------------------------------------------
* Tx Card T-line
*

.MODEL tx_card_line W MODELTYPE=FieldSolver,
+LAYERSTACK=stack_1, FSOPTIONS=opt1_1
+RLGCFILE=txcardli.rlgc
+CONDUCTOR=(MATERIAL=copper, SHAPE=rect, ORIGIN=(0m,0.00038989m)),
+CONDUCTOR=(MATERIAL=copper, SHAPE=rect, ORIGIN=(0.0002289m,0.00038989m))

________________________________________________________


And here is the resulting rlgc file:

_________________________________________________________
*SYSTEM_NAME : tx_card_line
*
*  ------------------------------------ Z = 4.1656e-07
*  //// Top Ground Plane //////////////
*  ------------------------------------ Z = 3.9878e-07
*       getek   H = 3.81e-07
*  ------------------------------------ Z = 1.778e-08
*  //// Bottom Ground Plane ///////////
*  ------------------------------------ Z = 0

* L(H/m), C(F/m), Ro(Ohm/m), Go(S/m), Rs(Ohm/(m*sqrt(Hz)), Gd(S/(m*Hz))

.MODEL tx_card_line W MODELTYPE=RLGC, N=2
+ Lo =  2.82310e-08
+       0.00000e+00  2.82310e-08
+ Co =  1.53499e-09
+       0.00000e+00  1.53499e-09
+ Ro =  9.61063e+06
+       0.00000e+00  9.61063e+06
+ Go =  0.00000e+00
+       0.00000e+00  0.00000e+00
+ Rs =  1.05871e+00
+      -2.46652e-03  1.05871e+00
+ Gd =  9.64460e-11
+       0.00000e+00  9.64460e-11

______________________________________________________


The results from the SigXplorer field solver indicate different values by a
factor of 10 in both capacitance and inductance of the track.

Could you have a look at the code and tell me if there is a problem with
the field solver or am i just missing something a bit more fundamental.

Thanks for your help,

Marek

**********************************************************
Marek Skibinski
Hardware Design Engineer
Nortel Networks
Doagh Road, Newtownabbey, Co. Antrim
BT36 6XA 
Tel: +44 (0)2890363494 (ESN 751-3494)
**********************************************************


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