[SI-LIST] How do you perform a frequency sweep of a differential coupled line model in Hspice ?
- From: Jon Stahl <jstahl@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 17 Feb 2004 21:28:54 -0500
Hi All,
I would really appreciate a suggestion on the proper way to perform a
frequency sweep of a differential coupled line model I have using
Hspice. I would like to determine the insertion loss vs. frequency for
the line when being driven by differential stimulus.
For a single line, it seems trivial to do the following:
Vinput input 0 ac=1
.print ac vdb(output, input)
However, I have had understanding how to peform the equivalent for
a coupled lines. For stimulus I have tried all of the following:
Vin_p in_p 0 ac=0.2
Vin_n 0 in_n ac=0.2
---
Vin_p in_p 0 ac=0.2
Vin_n in_n 0 ac=-0.2
---
Vin_p in_p 0 ac=0.2
Vin_n in_n 0 ac=0.2,180
---
.print ac decibels=PAR('20 * log(v(out_p, out_n)/v(in_p, in_n))')
However, when I do this I always get ZERO for the differential input
voltage v(in_p, in_n) (???), which of course messes up the result.
I have even tried the following:
Vstim in_p in_n 0 ac=1
Which just produces bizarre results.
Any insights into how to do this would be greatly appreciated ...
Thanks,
Jon Stahl
Avici Systems, Inc.
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