[ibis-interconn] Touchstone 3

From: Walter Katz <wkatz@xxxxxxxxxxxxx>
To: 'IBIS-Interconnect' <ibis-interconn@xxxxxxxxxxxxx>
Date: Sun, 16 Jan 2022 16:35:47 +0000

All,

I have done a reset on how we should proceed with Touchstone 3:

  1.  We need to add the backward compatibility rule (for Touchstone 2 and
above, not for Touchstone 1)
  2.  We need to add parsable port information

I do not think we should implement Sparse Data. There were two reasons for
Sparse Data

  1.  S-parameters to describe a full package
     *   I do not think the industry is capable of generating a full
s-parameter interconnect model for a 500 pin package.
     *   When companies who can and want to produce such package, they can
submit a BIRD to support it.
  2.  S-parameters to describe large connector model.
     *   Today, connector companies supply an s72p that describes 3 columns of
a 168 column 12 row connector.

                                                               i.      72=3*12*2

     *   I think this can be captured in a general way in parsable port
information records.

I would like to review the rules of formatting the network data. Putting aside
the special rules for s2p, my understanding is:

  1.  Touchstone 1
     *   The first line of data for a specific contains that frequency
     *   That line may have 4 Sij pairs of numbers
     *   Every row of data in an Sij starts on a new line.
  2.  Touchstone 2
     *   Relaxes the number of Sij pairs of numbers on a line
     *   Every row of data in an Sij starts on a new line.

Walter

Walter Katz
Work  508.647-7633
Cell      720.417-3762
[Description: Description: Visit MathWorks.com]

[ibis-interconn] Touchstone 3

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