[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.

Orin

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
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