[SI-LIST] Re: Using W-element in HSPICE

Bob--
Your RLGC information from the W-element will be extracted regardless of
what stimulus you apply to it.  In other words, the RLGC information is
strictly a function of geometry and material properties (with the exception
of your frequency-dependent losses, which have a calculated value that is
multiplied by a frequency).

So, to answer your question, the stimulus does NOT matter for what goes into
your .RLGC file, if you have selected that option in the field solver
definition to extract R,L,G, and C parameters.

However, if you are using the W-element right in your deck, you need to
apply a negative stimulus on one side and a positive one on the other side.
This will give you the proper output waveform, but will not effect the
numbers that go into the .RLGC file, if you are creating one.

I know APSIM RLGC puts out a differential impedance for the pair, and you
can get that from the W-element as well but you need to do quite a bit of
math with the outputted RLGCs...

Hope this helps.
And since your traces are on the same layer (coplanar), I believe they are
considered edge-coupled.  Broadside-coupled traces sit above one another on
different layers, with their broad sides facing one another.

--Pat

-----Original Message-----
From: Bob Patel [mailto:whizplayer@xxxxxxxxx]
Sent: Wednesday, May 29, 2002 4:50 PM
To: Michael_Greim@xxxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Using W-element in HSPICE



Hi! On item 3 I meant broadside coupled traces.
Thanks
Bob
--- Michael_Greim@xxxxxxxx wrote:
> On item three that sure looks edge coupled
> to me.  Is that what you meant?
> 
> MG
> 
> -----Original Message-----
> From: Bob Patel [mailto:whizplayer@xxxxxxxxx]
> Sent: Wednesday, May 29, 2002 4:15 PM
> To: si_list
> Subject: [SI-LIST] Using W-element in HSPICE
> 
> 
> 
> Hi!
> I had looked up the past archives on this subject
> pertaining to the definition of differential pairs.
> I
> had additional questions as to 
> 1)if I am extracting the RLGC for a diff pair do I
> apply the stimulus to one node only. And if YES then
> shouldn't I excite both the nodes differentially
> i.e.
> positive going to one node and inverting to the
> other.
> 2)Also when defining the stimulus does the stimulus
> have to represent the source of the frequency of
> interest i.e. the RLGC will be extracted based on
> the
> pulse source. e.g. at 2.5GHz the pulse source is
> (3.3
> 0 100ps 50p 50p 150p 400p)
> 3)When defining the model statement for the
> broadside
> coupled pair 
> + CONDUCTOR = ( MATERIAL=copper, SHAPE=rect,
> ORIGIN=(0, 7.2mil) )
> + CONDUCTOR = ( MATERIAL=copper, SHAPE=rect,
> ORIGIN=(17mil, 7.2mil
> i.e. the traces are 6mil above the gnd plane and are
> separated by 11mil & are 1.2mil thick. Is this
> correct?
> Thanks in advance.
> Bob
> 
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