[SI-LIST] : Backplane Board insertion problem

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From: Mendelsohn, Joseph P (Joseph) (jmendelsohn@lucent.com)
Date: Wed Dec 06 2000 - 08:14:32 PST


I would tend to agree with Mark. You probably do not have enough
capacitance in the backplane, or you do not have an inrush(soft-start)
circuit. There are many ways to avoid this problem. Check out the
following brief in EDN
http://www.ednmag.com/ednmag/reg/1997/121897/26di_07.htm
<http://www.ednmag.com/ednmag/reg/1997/121897/26di_07.htm> . This type of
circuit or, a simple MOSFET with a set RC time constant can help.
 
Joseph

-----Original Message-----
From: Mark Gill [mailto:gillmf@nortelnetworks.com]
Sent: Wednesday, December 06, 2000 9:22 AM
To: 'Dennis Schmitz'; si-list
Subject: RE: [SI-LIST] : Capacitor dielectric type

Dennis -
 
Your board insertion problem sounds more like an in-rush current problem
than power plane resonance. Do you have further details which would confirm
resonance over inrush?
 
Mark

-----Original Message-----
From: Dennis Schmitz [mailto:den@positron.net]
Sent: Tuesday, December 05, 2000 5:38 PM
To: si-list
Subject: Re: [SI-LIST] : Capacitor dielectric type

Can some kind person please point me to some references on power-plane
resonance? I am researching for a new backplane design of an existing system
where we are having some problems with board insertion causing disturbances
on the power distribution planes.
 
Thanks in advance.

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