[SI-LIST] Re: Hspice differential Tline

  • From: "Steven M. Waldstein" <swldstn@xxxxxxxxxxxx>
  • To: <timoceous@xxxxxxxxx>, "si" <si-list@xxxxxxxxxxxxx>
  • Date: Tue, 14 Oct 2003 23:17:47 -0400

Tim,

I'm not sure how to do specifically what you want
but I can tell you its very easy to use Welements
instead of Tlines and enter your actual board stackup
to the field solver and get either differential striplines
or microstrips in Hspice.

Thats what we use. We have a whole series of 1,2,3,5,10
line microstrip and stripline templates. We use these for
xtalk simulations as well.

If you want more info on this let me know. I'll pass it on.

Steve Waldstein
swldstn@xxxxxxxxxxxx


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of timoceous
Sent: Tuesday, October 14, 2003 8:32 PM
To: si
Subject: [SI-LIST] Hspice differential Tline


Hi Guru,

   I would like to know if there is a way to 
connect the hspice "T" element (ideal) to model
differential transmission line.  For instance, model
a pair of LVDS Tline.  I have tried but got lots
of reflection/ringing at the output.  Here is what
I have tried:

T1 Doutp GND VOP GND Z0=100.0 TD=500E-12 +IC=0.0 0.0
0.0 0.0 
T2 Doutn GND VON GND Z0=100.0 TD=500E-12 +IC=0.0 0.0
0.0 0.0

Rpa VOP VON 100

Note: Doutp/n are the LVDS driver output.

Thanks in advance,

Tim

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