Re: gEDA-user: Trace impedance calculations in PCB

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

Take a look at:

http://sourceforge.net/project/screenshots.php?group_id=201957

I think it would be cool to be able to select a couple of traces from
pcb and insert their info into an application like the above. perhaps
have some code that would follow the traces and every time one of the
traces, changed direction or width or layer, re-run the calculation and
then build a model of a TDR.


On Thu, 2009-02-12 at 10:51 -0600, John Griessen wrote:
> Jeffrey Gregory wrote:
> > Are there any plans to add trace impedance calculations to PCB?  
> 
> Not concrete ones yet that I've heard.
> 
> If not, is there an argument against it or just that no one has time
> Time, the avenger.
> 
>   What alternatives do people use?
> 
> Some pcb action commands can get you a per trace extraction to
> calculate simple area from, then apply heuristic mapping to
> lumped param model of the line(s) in other tools.
> 
> There's pondering of not-existing-yet speedup tools like gsch2cap, pcb2cap
> that will extract from schematic to gnucap, pcb layout to gnucap
> based on selection and choice of capacitance model to use.
> 
> No one's thinking of extracting shapes of trace loops and modeling
> mutual inductance, if that's what you mean...
> 
> John Griessen



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