Here are a set of rules worth recommending:
Engineering design checks:
1 Avoid spaghetti logic block diagram. Make certain there's a good flow
of functionality across and around the PCB. This includes using the concept
of transferring INFORMATION not ENERGY (except where one must, like with
: Friday, January 21, 2000 5:38 PM
To: cet...@cetest.nl; emc-p...@majordomo.ieee.org; rehel...@mmm.com
Subject: Re: RE: EMC Circuit Board Design
What do you recommend other than metal can oscillators in item 5 below?
Allen Tudor, Compliance Engineer
PairGain Technologies tel: (919
Yes, what Earl Morse said is very important! Always keep in mind we have to
carefully take care of BOTH signal trace and return path. If the reference plan
is solid, the return path would automatically make it's way to form a least
loop area with signal trace. (Why? least loop area - least
...@pairgain.com on 01/21/2000 10:38:09 AM
Please respond to Allen Tudor allen_tu...@pairgain.com
Sent by: Allen Tudor allen_tu...@pairgain.com
To: cet...@cetest.nl, emc-p...@majordomo.ieee.org, rehel...@mmm.com
cc:(Wolfgang Josenhans/MW/US/3Com)
Subject: Re: RE: EMC Circuit Board Design
What do
The number one problem with PCB board routing that we encounter that can be
attributed to the layout personnel is:
Routing high speed signal traces without regard for return current paths.
Either the signals are routed across splits in the reference plane or the
signal switches layers and the
...@apcc.com
Sent: Friday, January 21, 2000 6:28 AM
To: rehel...@mmm.com
Cc: emc-p...@majordomo.ieee.org
Subject: Re: EMC Circuit Board Design
There are a number of good books available on the subject. There are two
that I would recommend to start with.
Printed Circuit Board Design Techniques for EMC
The most common mistakes carried out on PCB are:
1 Use 2-layer instead of multi-layer boards
2 Permit high F clocks to go trough long traces ( 4 Mhz)
3 Place connectors all over the surface instead of corner or edge
4 Let input and out lines of analog and power circuits run unfiltered to the
There are a number of good books available on the subject. There are two
that I would recommend to start with.
Printed Circuit Board Design Techniques for EMC Compliance
Mark I. Montrose
IEEE Press
ISBN 0-7803-1131-0
IEEE Order Number PC5595
Noise Reduction Techniques in Electronic Systems
Most of the mistakes are by the design engineers and not the pcb designers.
The mistakes are:
* Mixing of I/O devices with clocks, processors and similar noisy
digital devices
* Inadequate power/ground isolation of noisy digital devices
* Inadequate I/O filtering
*
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