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

  • From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
  • To: <matusov@xxxxxxxxxxxx>, <Istvan.Novak@xxxxxxx>
  • Date: Fri, 6 Jul 2007 15:58:32 -0600

If the power supply noise is affecting your PLLs I suggest you look
at your decoupling and/or filtering appropriate VCC pins.

Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Mikhail Matusov
Sent: Friday, July 06, 2007 1:40 PM
To: Istvan.Novak@xxxxxxx
Cc: Christian D'Souza; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Mixed digital/RF board with switching power
supplies

----- Original Message -----=20
From: "Istvan Novak" <Istvan.Novak@xxxxxxx>
>=20
> 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).
>=20

Thank you Istvan. That's an interesting idea. I'll see into it...


/Mikhail
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