FreeLists / si-list / [SI-LIST] Re: Differential Z-One port

[timoceous <timoceous@xxxxxxxxx>]

Hi Craig,

     My E-mail got sent out too quick so I wasn't able
to finish what I was saying.  The element has three
ports:
         -----
---> 1 -|     | --> 2
         -----
           |
           3

     With port 3 as global ground.  I have used the
.NET and using Z11(i) and etc. to try to calculate
the Leq but got the wrong values.  I have also tried
to do what you have suggested which I used an AC
source
at port 1 and use a VCVS to mirror the same source
with
180 phase shift at port 2 and got the same wrong
result.

     I am curious if the .LIN with "port" sources in
the "Hspice" can do the trick.  From the .LIN and get
the S11,S12,S22,S21 etc and use it to transform it
to Z one port Leq.  Does any one know how to do that?
I am new to the "port" sources and every time I try
it, it failed to simulate.

Thanks,

Tim


--- Craig Clewell <tthumb0000@xxxxxxxxxxx> wrote:

> you can use the same source you have on now, but add
> a second and put a 180 
> phase shift on it, or you can use the same source
> and reverse the 
> positive/negative nodes so that the positive node is
> going to ground instead 
> of the negative.
> ----- Original Message ----- 
> From: "timoceous" <timoceous@xxxxxxxxx>
> To: "si" <si-list@xxxxxxxxxxxxx>
> Sent: Friday, September 02, 2005 5:50 PM
> Subject: [SI-LIST] Differential Z-One port
> 
> 
> > Hi all,
> >
> >   I have one element which I am tring to use
> Hspice
> > to find out the Leq.  I am told to use the
> imaginary
> > differential Z one port to measure the Leq.  The
> issue
> > is that I know how to do it single-ended but I
> don't
> > know how to do in differential.
> >
> > I have used .LIN for the single-ended measurements
> but
> > for the differential what kind of source would I
> use?
> >
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