There is Appcad, downloadable for free from HP. It has a section that 
lets you
calculate impedances of traces.

Rene


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Ing.Buero R.Tschaggelar - http://www.ibrtses.com
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Shuping Lew wrote:

>Hello, Everybody,
>
>Impedance control has been discussed before. I know Protel Stack manager
>and Design rule/Signal integrity/impedance constraint can do something
>with it. But there is minimum information in the Designer's Handbook or
>Protel on-line help.  I am still confused and do not know how to start.
>Can you give me some basic steps or guidelines for this topic? 
>
>P.S. It is 6 layers board(4 signal and 2 planes). Impedance is 100 ohms.
>  
>


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