Re: Separation of RF board and microcontroller board caused problems

From: Joerg (notthisjoergsch_at_removethispacbell.net)
Date: 09/01/04 

Date: Wed, 01 Sep 2004 20:32:17 GMT

Probably the ground trace on the flex isn't wide enough and now the
power trace acts as a ground connection as well. This can introduce
noise if the power supply isn't very clean or becomes modulated by heavy
load changes. Such load changes can happen when, for example, memory
banks on the controller are read or written to.

Bottomline you may have to add ground connections, ideally a plane
although that isn't easy on a flex. Also, look at your power supply with
a scope set to AC. Check it down to the millivolt level.

Regards, Joerg

http://www.analogconsultants.com

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