[SI-LIST] Re: Power Plane Noise Injection
- From: "Pommerenke, David" <davidjp@xxxxxxx>
- To: "Mark Alexander" <mark.alexander@xxxxxxxxxx>, "steve weir" <weirsi@xxxxxxxxxx>, "Vijay Chachra" <vijaychachra@xxxxxxxxxxx>
- Date: Fri, 2 Sep 2011 14:08:52 -0500
Group,
We have some experience with noise injection into PDN for PDN robustness
characterization. The general method injects a pretty large current into
the power plane and observes the noise voltage at different locations
and the system behavior.
Two methods seem to be working for current generation:
1) Use an arbitrary waveform generator and a RF power amplifier and some
impedance transformation to obtain enough current. The arbitrary
waveform generator can also be synchronized to some clock or software
events on the tested board.
2) Directly inject a current from a DC source using a power MOSFET that
is driven to drive the correct current amplitude and wave shape into the
power plane.
We have not published yet, as this is on-going, but if you are
interested please contact me directly, davidjp@xxxxxxxx
Regards,
David Pommerenke
Dr. David Pommerenke
Missouri University of Science and Technology (MST), former name: UMR
118 EECH, 301 W. 16th Street, Rolla, MO 65409-0040
573 341 4531, cell: 573 308 2019
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Mark Alexander
Sent: Friday, September 02, 2011 1:30 PM
To: steve weir; Vijay Chachra
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Power Plane Noise Injection
Vijay,
In characterizing the power networks of Xilinx FPGAs we most often use
the DUT as the noise generator. We have had limited success with using
a second "noise generation" FPGA to generate and transmit noise to a
separate DUT victim FPGA, but this requires building a complex and
specialized board. Small isolated power networks (transceivers, PLLs,
etc.) have a high enough impedance that it's possible to drive noise
into them with a broadband power amplifier, but this doesn't work for
large core power systems.
When using the DUT as the noise generator (our primary approach), the
simplest thing to do is build a giant shift register out of most of the
device's flops, and shift a 1-0-1-0 pattern through it. Shifting PRBS
patterns with various toggle densities approximates the activity of
various datapaths and data types. By sweeping the clock frequency and
working with the size of the shift-register, most potential designs can
be approximated. Similar noise generators are built out of all major
resources: DSP blocks, BlockRAM and other functional blocks, to
characterize their noise generation potential.
Whether the intention is to characterize PDN noise or the performance
impact of such noise (clock jitter, etc.) dictates the choice of probe
type and capture method. Careful experiment design and hygiene is
obviously important (plenty of null tests, use of symmetry, attention to
metrics).
This kind of testing provides no end of useful and interesting
information, though it takes a surprising amount of time, effort, debug
and refinement.
Regards,
mark
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of steve weir
Sent: Thursday, September 01, 2011 10:08 PM
To: Vijay Chachra
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Power Plane Noise Injection
Vijay, I am sorry I don't know of any publications on this subject. I
only know what I have done in my own work.
Steve
On 9/1/2011 8:32 PM, Vijay Chachra wrote:
> Steve,
> As a follow-up question...Is there a reference available which I can
> refer to for understanding how programmable device can help in noise
> injection on power plane?
> Will a simple LFSR type design work as "good enough" noise injector or
> Are there other tried and tested designs available?
> Thanks
> Vijay
>
>
> --- On *Fri, 9/2/11, steve weir /<weirsi@xxxxxxxxxx>/* wrote:
>
>
> From: steve weir <weirsi@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Power Plane Noise Injection
> To: si-list@xxxxxxxxxxxxx
> Date: Friday, September 2, 2011, 6:17 AM
>
> Jason, the issues at HF is coming up with enough raw power, and
> then a
> low enough impedance connection to the PDN. It is much easier to
> characterize devices on a purpose-built test PCB. A large
> CPLD/FPGA on
> the test PCB makes a good programmable noise generator.
>
> Steve.
> On 9/1/2011 2:21 PM, jason.pritchard@xxxxxxx
>
<http://us.mc1373.mail.yahoo.com/mc/compose?to=jason.pritchard@xxxxxxx>
> wrote:
> > Hi All,
> >
> > I have an application that I want to create noise on a power
> rail and determine the effects of that noise on a device.
> >
> > 1) What methods have people used to do this type of testing?
> > 2) If you use an RF transformer can you recommend a specific
> type/model that works effectively with the lower impedance of the
> power planes as a load?
> >
> > I would like to simulate DC-DC switching noise as well as high
> frequency noise.
> >
> > Any suggestions will be helpful.
> >
> > Thank-you,
> > Jason
> >
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> --
> Steve Weir
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--
Steve Weir
IPBLOX, LLC
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
(866) 675-4630 Toll-free
(707) 780-1951 Fax
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