Todd Hubing
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>Hi Gentlemen,
>
>Please allow me to present an alternative viewpoint and correct me.
>
>What does "good ground" mean? The definition of "good GND" should be
>"a low-impedance return path back to the source." If some unwanted
>current at low frequency (say, 50 Hz) can get back to it's source easily
>through earth GND, let's secure the connection from the unit to the
>earth. If EMI at RF comes from a chip inside the unit, why do we have to
>reduce the impedance at 3 GHz to earth ground through GND plane of PCB and
>backplanes?
>
>Regards,
>Barry.
>
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Dr. Todd Hubing email: [email protected]
Electromagnetic Compatibility Laboratory Phone: (314) 341-6069
University of Missouri-Rolla FAX: (314) 341-4532
Rolla, MO 65401 web: www.emclab.umr.edu
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