[SI-LIST] Re: Power Plane Noise Injection
- From: "Jeremy W. Webb" <jeremy.webb@xxxxxxxx>
- To: Vijay Chachra <vijaychachra@xxxxxxxxxxx>
- Date: Thu, 01 Sep 2011 21:32:28 -0700
Hi Vijay,
Check out this SI-LIST e-mail thread from 7/2001:
* //www.freelists.org/post/si-list/Injecting-noise-into-a-plane,3
There's also a similar thread from 9/2004:
* //www.freelists.org/post/si-list/Ripple-Injection,3
Here's a snippet of the thread that may be applicable for your measurement:
--- 16 Jul 2001 ---
I have actually done this. All you have to do is design a passive bias tee
to the desired frequency that you want to introduce
into your 3.3V Power Plane, and that should be sufficient for the
experiment.
Here is an example:
DC
|
C
C L
C
C |
AC ----||---------- AC + DC
F = 10kHz
L = 1000uH
C = 4.7uF
DC = +3.3V from Power Supply.
AC = 10kHz or whatever frequency you want to introduce into your system.
AC+DC = the voltage that is used to supply your board with +3.3V.
------------------------
Hope this helps.
Regards,
Jeremy
On 9/1/11 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 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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>
--
Jeremy W. Webb
Graduate Student
University of California, Davis
Department of Electrical and Computer Engineering
One Shields Avenue
Davis, CA 95616
E-mail: jwwebb@xxxxxxxxxxxxxxx
Website: http://www.ece.ucdavis.edu/~jwwebb/
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