At 10:28 AM 10/26/98 +0800, you wrote:
>Hi everybody,
>1) Would like to gather more information for board layout for EMC
especially for
>high speed and mixed signals. Can any body submit your list or provide me
with
>place that i can get this information ?

That's kinda tough.  Basic plan is

1)  What is the stackup?
2)  Stack higher to lower freq signal planes starting
    from component side on down to solder side.
3)  Avoid 4 layer boards (S1, GND, PWR, S2) unless you really
    know what you're doing.
4)  As few plane changes on a signal trace as possible.
5)  Solid ground planes is the rule,
    slicing up a ground plane is to be avoided.
6)  Never cross a slit in the ground plane with a signal trace.
7)  If you have a choice, partition your circuits into their
    own areas on the board. Favor on-board high freq circuitry
    toward the center of a board.  Favor off-board high freq
    circuitry near it's connector.
8)  Keep traces as short as possible.
9)  Keep traces as straight as possible.
10)  There can be a whole dissertation one way or the other
    as to what kind of angles to use in traces.  I tend to
    prefer angles no more than 45 degrees as the rule.
11) NEVER reference controlled impedance traces to a power plane.
...

The list could go on and on.

You might try ...

"High-Speed Digital Design - A Handbook of Black Magic"
 by Howard Johnson and Martin Graham, ISBN 0-13-395724-1

"Controlling Radiated Emissions by Design"
 Michel Mardiguian, Chapman & Hall, 1992.

"Digital Design for Interference Specifications"
 R.K. Keenan, The Keenan Corporation, 1983.
 (the grand daddy of them all ...)

"Printed Circuit Board Design Techniques for EMC Compliance"
 by Mark I. Montrose, ISBN 0-7803-1131-0

"Electromagnetic Compatibility Design Guide"
 E.R. Freeman and M. Sachs, Artech House, 1982.

"EMC: Electromagnetic Theory to Practical Design"
 P.A. Chatterton M.M. Houlden, John Willey & Sons, 1991.

"Grounding and Shielding Techniques in Instrumentation"
 R. Morrison, Third Edition, John Wiley and Sons, 1986.

"Noise Reduction Techniques in Electronic Systems", second edition
 H.W. Ott, John Wiley Interscience, NY, 1988.

But, be careful not to just blindly use suggestions.

Sorry for the lengthy post ...

Doug

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