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

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From: Boris Yost (yost@rainbowdisplays.com)
Date: Wed Sep 13 2000 - 11:58:55 PDT


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!

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