Sean Breheny wrote:
> Hi all,
> ...
> To minimize the spike, I am using film caps close to each FET
> source to return the current to the positive supply rail (where it
> ultimately comes from). There are also bulk electrolytic caps to
> prevent the current spikes from going back to the battery. Here's
> my problem: in order to properly place and size the caps, I need
> to be able to estimate the inductance between two points on the
> ground plane. Simulation shows that this makes a big difference.
> 
> I can find all kinds of formulas and calculators online for
> inductance, but I cannot find a copper sheet inductance formula.
>
> Any ideas?
> 
> Thanks,
> 
> Sean

I've heard http://www.mwoffice.com/ can do what you want.

Regards,
Dennis.


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