From: Mayer, Mike (firstname.lastname@example.org)
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
> -----Original Message-----
> From: Boris Yost [mailto:email@example.com]
> Sent: Wednesday, September 13, 2000 1:59 PM
> To: firstname.lastname@example.org
> 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
> Best regards,
> Boris Yost
> P.S. Order ferrite beads! Now! They will soon be on-allocation!
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