Re: gEDA-user: Trace impedance calculations in PCB

[Dan McMahill <dan@xxxxxxxxxxxx>]

Jeffrey Gregory wrote:
> 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?
> 
> Best Regards,
> Jeff

depends a little on what you want.  If you want to know what widths you 
need on your traces to achieve a particular impedance then wcalc, 
http://wcalc.sf.net,  is the way to go.  Look for a new version in the 
next few days which adds a few more structures.  You can also put in 
dimensions (2-d cross section) for a few selected structures and get 
back impedances.

If you are looking for a more general purpose "here is my .pcb file, 
give me a netlist that models RLCK for the whole layout" then, no, we 
don't have anything like that.  The closest we have there is PCB can 
export the files that NELMA needs to do some capacitance extraction. 
I've not used that feature so I can't comment on how well it works, run 
time, or accuracy.

What do you have in mind?  What should the calculations provide?  How 
would you want to access them?


-Dan





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