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

Thanks for your help!
 
I have developed a single simple circuit to test these two configurations.
The results match each other. The issue might lies in the circuit. 
 
Oops, sorry for the confusion brought by. And thanks for your information and 
reminder!

Rick Brooks <ricbrook@xxxxxxxxxxx> wrote:I think that the W line must have the 
same GND node at both ends of the 
line, it might even need to be spice node 0.
The RLGC matrices are with respect to spice node 0.
So, for the N=2 model, try this line:
W1 in1 in2 0 out1 out2 0 N=2 L=length RLGCMODEL=cps_102030X2_30

If you want reference planes that are not perfect spice node 0, then I 
think that you need to define them as
conductors, which would add to the dimension of the RLGC matrices. This way 
you can have separate
nodes for the reference conductor at each end of the transmission line.

thanks,
- Rick




At 03:59 PM 8/24/2003 +0800, you wrote:
>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 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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