RE: [SI-LIST] : Bead-choking the power supply--everywhere!

About this list Date view Thread view Subject view Author view

From: Mayer, Mike (mikem@artesyncp.com)
Date: Wed Sep 13 2000 - 12:40:03 PDT


I though "one capacitor per IC" was overkill! I think caps are already on
allocation, so good luck.

============================================================================
=
Mike Mayer Artesyn Communication Products, Inc
Senior Hardware Design Engineer Madison, WI
mikem@artesyncp.com http://www.artesyncp.com
============================================================================
=

> -----Original Message-----
> From: Boris Yost [mailto:yost@rainbowdisplays.com]
> Sent: Wednesday, September 13, 2000 1:59 PM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : Bead-choking the power supply--everywhere!
>
>
> Dear list members:
>
> I'm looking at a design right now--portions of which
> were inspired by an
> "EMI expert". Specifically, instead of ordinary decoupling
> practice, there
> are filters with a capacitor on each side of a ferrite
> bead...individually...for each and every device on the board.
> Almost all of
> the devices have "CMOS" outputs--the output goes to the high
> rail. Almost
> all of the devices are fully static logic. The system is a
> digital video
> display, it has one input, and the board output doesn't leave
> the box. 80%
> of the board, and everything doing real work, operates
> synchronously to the
> input clock.
> Is this "decoupling" scheme overkill, useful, or a
> disaster waiting to
> happen?
>
> Best regards,
> Boris Yost
>
> P.S. Order ferrite beads! Now! They will soon be on-allocation!
>
>
> **** To unsubscribe from si-list or si-list-digest: send e-mail to
> majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
> si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
> si-list archives are accessible at http://www.qsl.net/wb6tpu
> ****
>

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue May 08 2001 - 14:29:29 PDT