[SI-LIST] reference plane of W element

 
Hi all, I am zam, a student. This is my first posting so I hope I did not
open a thread in the wrong section. 

I am currently doing a study on decoupling of power bus. I am using the w
element in hspice to model the interconnects. However, I am not certain of
the reference plane in this w element. Does hspice model it as a perfect
conductor? I read through the manual esp on the field solvers examples but
all of them uses PEC as the material for the reference/metal layer. Does
thismean that if I use a metal layer made of copper, the reference plane
becomes non ideal? So if I do not want a perfect reference plane, how do I
goabout it? Hope somebody out there can clarify with me on this matter. Have
a nice day people. [IMG]

Below is part of my netlist for my study:  

  

W1 vdd gnd vddpin gnd N=1 l=0.15 

+FSmodel=mysolver 

+INCLUDERSIMAG=YES 

  

.MATERIAL diel_1 DIELECTRIC ER=2.5 

+LOSSTANGENT=1.9e-3 

.MATERIAL copper METAL 

+CONDUCTIVITY=5.88e7 

  

.SHAPE mytrace RECTANGLE WIDTH=127um HEIGHT=35um 

  

.LAYERSTACK mystack 

+LAYER=(copper,35um),LAYER=(diel_1,630um) 

  

.FSOPTIONS myoption ACCURACY=HIGH 

+GRIDFACTOR=1 PRINTDATA=YES 

+COMPUTEGD=YES COMPUTEGO=YES 

+COMPUTERS=YES COMPUTERO=YES 

  

.MODEL mysolver W MODELTYPE=FieldSolver 

+LAYERSTACK=mystack FSOPTIONS=myoption 

+RLGCFILE=microstrip.rlgc 

+CONDUCTOR=(SHAPE=mytrace MATERIAL=copper ORIGIN=(0,665um)) 


 

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