[ibis-interconn] Re: Sparse matrix/label treatment, draft 3...
- From: "Brad Brim" <bradb@xxxxxxxxxxx>
- To: "'IBIS-Interconnect'" <ibis-interconn@xxxxxxxxxxxxx>
- Date: Wed, 14 Oct 2009 09:08:15 -0700
hi John,
this might help to visualize the application of blank/empty integer labels
-Brad
_____
From: ibis-interconn-bounce@xxxxxxxxxxxxx
[mailto:ibis-interconn-bounce@xxxxxxxxxxxxx] On Behalf Of Angulo, John
Sent: Wednesday, October 14, 2009 12:25 AM
To: IBIS-Interconnect
Subject: [ibis-interconn] Re: Sparse matrix/label treatment, draft 3...
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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