[SI-LIST] Re: Power Plane Noise Injection
- From: Surjendra Goswami <goswamisurjendra@xxxxxxxxx>
- To: jeremy.webb@xxxxxxxx, vijaychachra@xxxxxxxxxxx
- Date: Fri, 2 Sep 2011 10:54:55 +0530
Vijay/Jeremy,
I have used the same method (using Bias Tee) for injecting noise to a power
plane with the test board having no decoupling capacitors.
But in the setup I need to have a feedback near the power pin to monitor the
amount of noise actually reaching the device.
This is because I have additional noise sources which add up the noise.
Also if the board has PWR GND plane coupling then some of the noise is
decoupled.
Regards
Surjendra
On Fri, Sep 2, 2011 at 10:02 AM, Jeremy W. Webb <jeremy.webb@xxxxxxxx>wrote:
> 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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