Re: [SI-LIST] : Re: approximations for partial self inductance - WHY

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From: Doug McKean (dmckean@corp.auspex.com)
Date: Mon Mar 19 2001 - 11:13:45 PST


Well, hello people.

When discussing return paths and why they do what they do,
I'm having a problem with the statement that - return paths
at high freqs take the path of least inductance.

I've actually drawn this out and don't understand where
this came up when clearly the path of least inductance
in most cases is not directly underneath the signal trace.

Now, I have an explanation why the return path seeks to
be under the signal trace. It has to do with the Lorentz
force (the right hand rule using the Lorentz force to be
exact) and the way negative charges move in the presence
of a magnetic field. But it has nothing to do with the
path of least inductance.

The explanation is simple but, as usual, I can make rather
lengthy. So, I can post it here or discuss off-line ...

Regards, Doug McKean

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