[SI-LIST] Re: Power Integrity Measurements
- From: <colin_warwick@xxxxxxxxxxx>
- To: <rula.bakleh@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 6 Aug 2009 13:22:56 -0600
Hi Rula,
Here's an App Note that might be useful:
"Ultra-Low Impedance Measurements Using 2-Port Measurements"
http://cp.literature.agilent.com/litweb/pdf/5989-5935EN.pdf
-- Colin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of rula.bakleh@xxxxxxxxxx
Sent: Thursday, August 06, 2009 2:53 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Power Integrity Measurments
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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