[SI-LIST] Re: Mixed digital/RF board with switching power supplies

  • From: olaney@xxxxxxxx
  • To: olaney@xxxxxxxx
  • Date: Fri, 6 Jul 2007 13:01:06 -0700

It that's the case, on  a spectrum analyzer you will see a spur at the
ringing frequency surrounded by sidebands at +/- the switching frequency
and harmonics of it, in a classic "Christmas tree" shape.


On Fri, 6 Jul 2007 15:40:14 -0400 "Mikhail Matusov"
<matusov@xxxxxxxxxxxx> writes:
> ----- Original Message ----- 
> From: "Istvan Novak" <Istvan.Novak@xxxxxxx>
> > 
> > It might be worth checking to see if the spurious signal that pops 
> up is
> > a ringing on the switching edge rather than the harmonic of the
> > switching frequency.  If it is ringing, you may be able to reduce 
> it
> > substantially either by using an appropriate second source of 
> changing
> > the converter layout (in case it is your embedded design).
> > 
> Thank you Istvan. That's an interesting idea. I'll see into it...
> /Mikhail
> ------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List technical documents are available at:

List archives are viewable at:     
or at our remote archives:
Old (prior to June 6, 2001) list archives are viewable at:

Other related posts: