Re: gEDA-user: Trace impedance calculations in PCB

[Stuart Brorson <sdb@xxxxxxxxxx>]

> Are there any plans to add trace impedance calculations to PCB?  If
> not, is there an argument against it or just that no one has time and
> interest?  What alternatives do people use?

As Joe pointed out too, PCB doesn't not know about the metal layer
separation distance, nor does it know the dielectric constant of your
insulating material.  Therefore, it cannot do impedance calcs.

I am not aware of any PCB layout programs which provide you impediance
calcs.  However, Microwave Office might, since it targets this type of
application -- I've just never used it.

If you know your trace geometry and dielectric coefficient, you can
use Dan McMahill's program wcalc to analyze impedances:

http://wcalc.sourceforge.net/

HTH,

Stuart


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