FreeLists / si-list / [SI-LIST] Re: 4-port node numbering

["Grossman, Brett" <brett.grossman@xxxxxxxxx>]

Ray,

I would say no there is no general industry standard.  Though I do agree
with your comment on which is most common.

My basis for this: Of the many companies that now produce multiport
network analyzers, there was one major provider that changed between the
two numbering schemes based on the calibration algorithm chosen.

Now, nearly all VNA providers allow you to renumber the measurement
ports to your preferred convention.  So some degree of a general
industry convention may be feasible.

My $0.02,
-Brett



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ray Anderson
Sent: Tuesday, December 13, 2005 11:49 AM
To: si-list@xxxxxxxxxxxxx
Cc: Ray Anderson
Subject: [SI-LIST] 4-port node numbering

I have general question regarding 4-port s-parameter files. Does anyone
know if there is a generally accepted industry standard for node
numbering?
=20

I have seen both of these schemes used in various places:

=20

a)

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        +-----+

    1---|     |-----2

        |     |           =20

    3---|     |-----4

        +-----+

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=20

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b)

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        +-----+

    1---|     |-----3

        |     |           =20

    2---|     |-----4

        +-----+

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It has been my observation that scheme a) is the most common and
intuitive (when I think S12 I think transmission and when I think S13 I
think crosstalk) however scheme b) has popped up often enough to be a
possible contender.

=20

Comments???

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-Ray

=20

=20

Raymond Anderson

Senior Signal Integrity Staff Engineer

Product Technology Department

Advanced Package R&D

Xilinx Inc.

=20

=20


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