[SI-LIST] Re: N-port model limitations in simulators
- From: Ray Anderson <Raymond.Anderson@xxxxxxx>
- To: arpad.muranyi@xxxxxxxxx
- Date: Fri, 25 Apr 2003 10:43:49 -0700 (PDT)
Arpad-
I would define a "Port" as being defined by two "Terminals
or nodes". One of the nodes would be a 'signal' node and
the other would be a 'reference' node.
As I mentioned when I brought up this topic several days ago,
some n-port models (n >= 2) contain but a single reference for
all ports, while some conform to the tradional definition of
an n-port and provide a reference for each port.
If your model has a reference for each port then you will have
2*n terminals for an n-port. If your model only allows a single
reference for all ports then you will have n+1 terminals or nodes.
And yes you are correct, depending on how your n-port model handles
the refererence node issue, the way the n-port model may be used
may be restricted for certain purposes.
As Marek Schmidt-Szalowski pointed out this morning, by utilizing
a"perfect" transformer (perhaps an Hspice E elment) you may convert
a 3 terminal 2-port to a 4 terminal 2-port.
-Ray Anderson
>
>I would like someone to give us a definition of "port".
>
>The reason I am asking for this is because I think there
>is an important detail that makes things confusing in these
>responses. Is a port just one node, *assuming* a universal,
>global reference (as in SPICE node 0)? Or does a port
>consist of two nodes, neither one of which is GND (node 0)
>between which the measurements are done with respect to
>each other? The first one could also be called single=20
>ended, and the second one differential. There may be far
>reaching implications depending on how we define "port".
>
>Arpad
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