Re: [SI-LIST] : How to construct guard bands in Ansoft 2D

J. Eric Bracken (bracken@ansoft.com)
Fri, 29 May 1998 13:24:13 -0400

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Charles,

Making the trace a 'non-ideal ground' will indeed do the job... a
'signal' line would be just as good.

You can connect the guard trace to ground at the Spice/schematic
capture level. In other words, if your guard lines run 1cm between
ground vias, export the coupled transmission line model for length =
1cm. Take the non-ideal ground terminals of the Spice subcircuit that
2D Extractor produces, and hook them to ground. Hook the signal lines
up to the next subcircuit in the chain. Then run Spice and watch the
ringing/reflections begin!

The attached figure illustrates the Spice procedure.

--Eric

>>>>> "Chaz" == Chaz <Grasso> writes:

Chaz> Does anyone know how to construct a guard band in Ansofts 2D
Chaz> extractor?

Chaz> Do I simply make the additional trace a non-ideal ground?

Chaz> Also I cannot seem to connect the trace to the ground to
Chaz> simulate a via?

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--
J. Eric Bracken, Ph.D.                          Tel: 1.412.261.3200 x135
Group Leader, Signal Integrity R&D              Fax: 1.412.471.9427
Ansoft Corp., Four Station Square, Suite 660    bracken@ansoft.com
Pittsburgh, PA USA 15219-1119                   http://www.ansoft.com   

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