[ibis-interconn] Re: Sparse matrix/label treatment, draft 3...
- From: "Angulo, John" <john_angulo@xxxxxxxxxx>
- To: "IBIS-Interconnect" <ibis-interconn@xxxxxxxxxxxxx>
- Date: Wed, 14 Oct 2009 00:24:45 -0700
To reiterate my comment in last week's meeting on the use of [Sparse Matrix
Mapping] labels without "index pairs": If the [Sparse Matrix Mapping] keyword
does not map a column of [Network Data] into the full matrix, then the EDA tool
does not have a way to simulate the S-parameter data in that column without
further information.
If the model maker provides suitable comment text in the Touchstone file, or if
a third party consultant knows how the [Network Data] columns corresponding to
the empty labels in a particular file are to be treated, then the user of an
EDA tool can modify the [Sparse Matrix Mapping] keyword text by hand to select
the active subset of [Network Data] columns.
More automated ways to give further information might include having multiple
[Sparse Matrix Mapping] keywords in the Touchstone file, each with a
subparameter identifying the alternative mapping by some name. Another way
might be to somehow override or supplement [Sparse Matrix Mapping] through a
new keyword in the [Begin Information]/[End Information] section.
However it is done, it seems certain that some additional information is
necessary to make use of [Sparse Matrix Mapping] labels without index pairs.
When should this committee consider whether and how the Touchstone format
should convey this information? Should the proposed language allowing empty
[Sparse Matrix Mapping] labels, and hence unused columns of [Network Data], go
into a Touchstone 2.x specification without such consideration?
Thanks,
John
________________________________
From: ibis-interconn-bounce@xxxxxxxxxxxxx on behalf of Mirmak, Michael
Sent: Wed 10/7/2009 8:56 AM
To: IBIS-Interconnect
Subject: [ibis-interconn] Sparse matrix/label treatment, draft 3...
For review and discussion...
- MM
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