[SI-LIST] Re: Draft Touchstone 2.0 document available
- From: "Zabinski, Patrick" <zabinski.patrick@xxxxxxxx>
- To: <michael.mirmak@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sun, 16 Dec 2007 09:33:00 -0600
Michael,
Thank you and the IBIS Open Forum for supporting and updating
the Touchstone Spec. The spec has become a de facto industry
standard, and it is in much need of updating.
Overall, I really like the improvements suggested in Draft Version 2.
They should enhance the utility of the file format and ease
tool development that supports the format.
I spoke with a few folks about the draft, and we would appreciate
consideration of one change. Under Network Parameter Data, the
ordering of the S-parameter matrix elements are consistent for
most - but not all - matrix sizes.
More specifically, the 1-, 3-, 4-, 5-, ... port matrices are
presented in Ascending-Row then Ascending-Column order, which
matches most (all?) common matrix representations.
In contrast, the 2-port matrix breaks this order, in that S21
(Row 2) is listed before S12 (Row 1). =20
Although we can generally adapt to the 2-port matrices having their
own unique element ordering, it has historically caused many
issues for several of us. Several analysis and measurement tools
do not follow this ordering, and many engineers are unaware of
the uncommon ordering.
If at all possible, we would much appreciate the 2-port matrix
element ordering to comply with the rest of the spec. By doing so,
it would make Touchstone format consistent with many
commercially-available
tools and make it easier (i.e., less error prone) for folks to
develop tools around it.
Much appreciate your consideration.
Pat
>=20
>=20
> -----Original Message-----
> From: Mirmak, Michael=3D20
> Sent: Wednesday, December 12, 2007 5:26 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: Draft Touchstone 2.0 document available
>=20
>=20
> The IBIS Open Forum has completed a draft of an improved Touchstone
> specification, entitled Touchstone 2.0, to expand the capabilities of
> the original format and eventually release it as an industry standard.
> Some of the changes in the new version include:
>=20
> - support for independent per-port reference impedances
> - the number of ports that may be represented is unlimited
> - support for lower- or upper-half matrix representations, to reduce
> file size
> - the version number, the number of ports and the number of=20
> frequencies
> in any file have all been made explicit
>=20
> Backward compatibility with 1.0 models has been preserved.
>=20
> Touchstone 2.0 will be formally introduced at this week's IBIS Open
> Forum teleconference, for review and comment in preparation for
> standardization.
>=20
> The latest review draft may be obtained at the URL below. =20
> Comments are
> welcome.
>=20
> http://www.eda.org/ibis/docs/touchstone2_review_draft.pdf=3D20
>=20
> - Michael Mirmak
> Intel Corp.=3D20
> Chair, IBIS Open Forum
>=20
> http://www.eigroup.org/ibis/
> http://www.eda.org/ibis/
>=20
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