[SI-LIST] Power Integrity Measurements
- From: "Eric Bogatin" <eric@xxxxxxxxxxxxxxx>
- To: <rula.bakleh@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 Aug 2009 07:31:52 -0500
Rula-
Just to add one last note to the others on this topic:
In addition to the general app note that Colin referenced,
http://cp.literature.agilent.com/litweb/pdf/5989-5935EN.pdf
I also have a paper I wrote reviewing exactly what you are trying to do: use
2 port measurements of a test vehicle to verify the accuracy of a PDN
analysis tool. You can download a copy from my web site.
It is BTS113 Establish confidence in PDN Simulation.
http://www.bethesignal.net/bogatin/index.php?cPath=28
<http://www.bethesignal.net/bogatin/index.php?cPath=28&ref=SIList02>
&ref=SIList02
I've arranged to make this app note available for free for the next week.
--eric
*******************************************************
Dr. Eric Bogatin, Signal Integrity Evangelist
Bogatin Enterprises
Setting the Standard for Signal Integrity Training
Next "No Myths Allowed" webinar:
"Stack-up Design for Differential Pairs"
Sept 16, 2009 1pm EDT
Next public classes: EPSI, ASID
Aug 11-14, 2009, Hillsboro, OR
<http://www.bethesignal.com/> www.BeTheSignal.com
Blog: <http://www.bethesignal.com/blog> www.beTheSignal.com/blog
26235 W 110th Terr
Olathe, KS 66061
e: <mailto:eric@xxxxxxxxxxxxxxxx> eric@xxxxxxxxxxxxxxx
v: 913-393-1305 cell: 913-424-4333 f: 913-393-0929
***********************************************
Msg: #2 in digest
From: rula.bakleh@xxxxxxxxxx
Subject: [SI-LIST] Power Integrity Measurments
Date: Thu, 6 Aug 2009 14:52:54 -0400
Hi Everyone,
I'm trying to validate our power integrity tools/simulations and I would
like to make some power integrity measurements of our planes.
With respect to performing these measurements, I plan to use a Vector
Network Analyzer (VNA) to measure the plane impedances of a bare PWB and a
PWB with a voltage plane that is populated with only caps in order to
correlate these measurements to the simulations. I also plan to measure the
plane impedance of a fully populated PWB, just to see the effects that other
parts' impedance/mounting would have on the plane impedance.
I also plan to use a spectrum analyzer to measure the plane noise spectrum
of a powered up module and use an oscilloscope to measure absolute levels of
this noise. The purpose of using a spectrum analyzer/oscilloscope is to
measure the simultaneous switching effects on the plane, hoping to isolate
the PWB effects from internal SSO effects of a component.
My dilemma is the following:
The VNAs are optimized for 50 ohms and plane impedances of PWBs are designed
for very low impedance (most of the time much <1.0 ohm).
1) Due to the impedance discontinuities, what is the expected accuracy
of such a measurement?
All the research I have conducted concerning PWB impedance measurements
points to using a VNA. During my discussions with an Agilent FAE, he
recommended using an Impedance Analyzer vs. VNA to measure the PDS of a
plane. He also recommended using a high impedance active solderable probe
with the impedance analyzer with it being calibrated out to make this
measurement.
2) What is the best equipment to use to measure the PDS of a PWB (VNA or
Impedance Analyzer)?
3) If the answer is an Impedance Analyzer, is the approach described above
correct?
4) Can somebody validated my approach for this type of
analysis/measurements?
Thank You,
Rula
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