Doug has some excellent advice!
Douglas McKean wrote:
> 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.
unless it's ECL... :-)
> The list could go on and on.
Indeed!
> 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
Not at all Doug, thanks!
<< UBI MAJOR, MINOR CESSAT >>
---------------------------------------------------------------
Eric Bonatti - Senior Printed Circuit Board Designer
GN Nettest (CANADA) Datacom Division "Total Care For Networks"
phone: 905-479-8090 xt.497 / fax: 905-475-6524
email: [log in to unmask]
web: http://www.gnnettest.com
---------------------------------------------------------------
################################################################
DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe: SUBSCRIBE DesignerCouncil <your full name>
To unsubscribe: SIGNOFF DesignerCouncil
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################
|
