Re: [SI-LIST] : EMC techniques on 2-layer board

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From: John Howard (jhoward@emcguru.com)
Date: Fri Feb 04 2000 - 00:10:05 PST


Best Greetings,
     High performance 2-layer (or even 1-layer) boards are indeed
possible - but difficult. I agree with the recommendation of others in
suggesting that you study the books by Clayton Paul and Howard
Johnson. Add to that another book "Controlling Radiated Emissions
by Design", by Michel Mardiguian, Chapman & Hall, NY. One of the
most serious issues to consider in designing such a board will be the
extent of coupling between distributed signals and their respective
return paths. To ignore this is to design a PCB that will "shine".
Good Luck

John Howard
EMC Consultant
www.emcguru.com

Wang Lin wrote:

> Hi, all
>
> I'm doing radiated emission simulations for a 2-layer board. A complete
> ground plane is not possible here because there're quite many traces on
> this board. The rise time of the signal is 3ns, frequency is 5MHz. The
> crystal is 16MHz. The intention of using 2-layer instead of 4-layer is
> for saving cost. Current simulation results based on the inatial layout
> show that the radiated emission has already exceeded the standard.
>
> Can someone suggest if realizing such a board using 2-layer is possible
> or not? If yes, any advice on how to layout the board, considerations
> for matching, bypassing, or any other possible problems?
>
> Thanks.
>
> Wang Lin
> Institute of High Performance Computing
> Singapore
>
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