[SI-LIST] Re: Measuring Power and Ground Plane Noise
- From: Khalid Ansari <KANSARI@xxxxxxxxxx>
- To: "'pgregory@xxxxxxxxxx'" <pgregory@xxxxxxxxxx>,"'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 30 Aug 2002 09:48:04 -0700
Paul,
What I have done in the past is that I have
tied the plane to my sampling scope, I have
looked at the noise using the noise itself
as the trigger. When you start increasing
the threshold of your trigger in either
direction you will start getting rid of the
noise which have less amplitude at certain
frequencies and as you keep on increasing
the threshold you will see that you will
be left with some waveforms that will be
your dominant noise. The 66 MHz that you
are talking about might be in there. You
can measure the amplitude from there.
Khalid
-----Original Message-----
From: pgregory [mailto:pgregory@xxxxxxxxxx]
Sent: Thursday, August 29, 2002 1:46 PM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Measuring Power and Ground Plane Noise
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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