[SI-LIST] Loss in HSPICE W Element

  • From: "Timothy Coyle" <Timothy.Coyle@xxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Fri, 14 Mar 2003 08:45:53 -0500


Hi,
I have made a 100 Ohm differential microstrip trace using the HSPICE field
solver. I am trying to get the field solver to give
loss results, such as Rs and Ro. But each time I run HSPICE, I only get L
and C values. Can anyone see what I might be
doing wrong? I am using version 2001.2

Thanks,
Tim



*
* Define the board materials
.MATERIAL dielectric_fr4 DIELECTRIC ER=4.2 LOSSTANGENT=0.02
.MATERIAL copper METAL Conductivity=5.813E7

* Define the cross section of the traces as a rectangle
* 1.0 oz. copper has height of 1.44mils
.SHAPE rect RECTANGLE WIDTH=6mil, HEIGHT=1.2mil

* Define the layer stackup
* Layer=(material name, thickness)
.LAYERSTACK diff_micro
+ LAYER=(PEC,1um)             * ideal air (top layer)
+ LAYER=(dielectric_fr4,3.5mil)           * dielectric layer

* Define Field Solver Options
.FSOPTIONS opt1 PRINTDATA=yes
+ ACCURACY=HIGH
+ ComputeRo=yes ComputeRs=yes ComputeGo=Yes ComputeGd=yes
* Model Definition
.MODEL diff_microstrip W MODELTYPE=FieldSolver,
+ LAYERSTACK=diff_micro, FSOPTIONS=opt1,
+ RLGCFILE=diffmicro.rlgc
+ CONDUCTOR=(SHAPE=rect, ORIGIN=(0,3.5mil)),
+ CONDUCTOR=(SHAPE=rect, ORIGIN=(100mil,3.5mil))
*


*SYSTEM_NAME : diff_microstrip
*
*       Half Space, air
*  ------------------------------------ Z = 8.99e-05
*       dielectric_fr4   H = 8.89e-05
*  ------------------------------------ Z = 1e-06
*  //// 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 diff_microstrip W MODELTYPE=RLGC, N=2
+ Lo =  2.88615e-07
+       6.05346e-10  2.88615e-07
+ Co =  1.15222e-10
+      -4.70212e-14  1.15222e-10
+ Ro =  0.00000e+00
+       0.00000e+00  0.00000e+00
+ Go =  0.00000e+00
+      -0.00000e+00  0.00000e+00
+ Rs =  0.00000e+00
+       0.00000e+00  0.00000e+00




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