[SI-LIST] Re: W-element in hspice

sorry for the typo!!
 
The command lines should be:
 
1. 
W1 in1 0 out1 0 N=1 L=length RLGCMODEL=cps_102030
W2 in2 0 out2 0 N=1 L=length RLGCMODEL=cps_102030  
.model cps_102030 W MODELTYPE=RLGC
+ N=1
+ Lo =7.955539012541763e-007  
+ Co = 5.977204400100264e-011
+ Ro =  3362.163358282071   
+ Go =         0          
+ Rs =0.01781587892113573  
+ Gd =1.151478112888962e-010  
 
 
2.
W1 in1 in2 gnd1 out1 out2 gnd2 N=2 L=length RLGCMODEL=cps_102030X2_30

.model cps_102030X2_30 W MODELTYPE=RLGC
+ N= 2
+ Lo =7.955539012541763e-007  0  7.955539012541763e-007
+ Co = 5.977204400100264e-011 0   5.977204400100264e-011
+ Ro =  3362.163358282071      0       3362.163358282071
+ Go =         0                       0                       0
+ Rs =0.01781587892113573    0    0.01781587892113573
+ Gd =1.151478112888962e-010  0  1.151478112888962e-010 
 
There simulation results should be same but the results are weird.
They are different?
 
Any people share this kind of experience with me? Or know the root cause?

Rick Brooks <ricbrook@xxxxxxxxxxx> wrote:
I'm not sure I understand your question..

One of these models is for a single ended transmission line, the other is for a
coupled line or differential pair although there seems to be no coupling 
between
the two lines.
I think that you may need to have a Go line in the first model located 
after the Ro line.

I hope it helps,
- Rick






At 10:11 PM 8/23/2003 +0800, you wrote:
>Hi, experts:
>
>I had a problem on W-element in hspice.
>
>I am using two kinds of ways to simulate two transmission lines:
>
>1. Use
>
>W1 in1 0 out1 0 N=1 L=length RLGCMODEL=cps_102030
>W2 in2 0 out2 0 N=1 L=length RLGCMODEL=cps_102030
>..model cps_102030 W MODELTYPE=RLGC
>+ N=1
>+ Lo= 7.955539012541763e-007
>+ Co= 5.977204400100264e-011
>+ Ro= 3362.163358282071
>+ Rs= 0.01781587892113573
>* Gd= 1.151478112888962e-010
>
>2. Use
>
>W1 in1 in2 gnd1 out1 out2 gnd2 N=2 L=length RLGCMODEL=cps_102030X2_30
>..model cps_102030X2_30 W MODELTYPE=RLGC
>+ N= 2
>+ Lo =7.955539012541763e-007 0 7.955539012541763e-007
>+ Co = 5.977204400100264e-011 0 5.977204400100264e-011
>+ Ro = 3362.163358282071 0 3362.163358282071
>+ Go = 0 0 0
>+ Rs =0.01781587892113573 0 0.01781587892113573
>+ Gd =1.151478112888962e-010 0 1.151478112888962e-010
>
>
>Simulation with these two kins of configurations are different. Can any 
>one help me find the reason?
>Any thing special in Hspice worth attention?
>
>Thanks!
>BH @emlab
>
>
>
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