> 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 _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
