[SI-LIST] Measuring Power and Ground Plane Noise
- From: pgregory <pgregory@xxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 29 Aug 2002 14:46:02 -0600
How does one properly measure power plane or ground plane noise? I have a
case where I believe there is 66 MHz noise on the planes. I want to know
how much noise is on each plane.
Both measurements require a reference point that you must assume to be
stable, or perhaps that is considered stable by the measurement. So I
measure across a decoupling capacitor and that shows some noise on the power
plane. But how do I get a good measurement of the ground noise? And if
there is noise on the ground plane, how do I get that noise out of the power
plane measurement?
Thanks for any help.
- Paul
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