[SI-LIST] : Power Supply decoupling for Video Accelerator

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From: Massimo Polignano (massimo.polignano@esaote.com)
Date: Fri Apr 20 2001 - 05:46:32 PDT


Hallo everybody!

We are going to use a Video Accelerator (69000 Chips HiQVideo) to drive a
LCD. In the data book the manufacturer seems to be very much concerned with
PCB layout and power supply decoupling. They suggest the use of three
different grounds and power supply filtering using more than one LC or RC
cell and more than one decoupling capacitor of the same value in parallel.

Usually I prefer to have just one very good ground plane and one high
capacitance capacitor at the entrance of the power supply into the board
and one well selected capacitor (parasitic inductance, charge, ...) close
to the chip pins. Facing suggestions like those above, one is always in
doubt whether the chip designer made accurate tests, simulations and
prototyping or he just wants to stay on the safe side.

Does anybody out of there have any thought on the matter?

Thanks
m.p.
-------------------------------------------------------------
ESAOTE S.p.A. Massimo Polignano
Research & Product Development Design Quality Control Mngr
Via di Caciolle,15 tel:+39.055.4229402
I- 50127 Florence fax:+39.055.4223305
        e-mail: massimo.polignano@esaote.com

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