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

[Jinghua Huang <Jinghua.Huang@xxxxxxxxxxxx>]

Hi Tim,

If you want to make port 1 and port 2 as a differential pair, with port
3 as the reference node, you can use the mixed mode Port element and
.lin command to perform the the mixed mode parameter extraction in
HSPICE.

Mixed mode port element is a three node source, with the first and the
second node forming the differential pair, and the third node as the
reference node. For your case, you can set

pin 1 2 3 port=1 ac=1 
.lin
.print zind(1)  $ differential input impedance
                $ or zinc(1) for common mode input impedance

Hope this helps,
Jinghua

On Sat, 2005-09-03 at 06:57, timoceous wrote:
> 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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