[SI-LIST] Re: Stub Definition
- From: "DAmbrosia, John F" <john.dambrosia@xxxxxxxxxxxxxxxxxxx>
- To: "'djohnson@xxxxxxxxxxxxxx'" <djohnson@xxxxxxxxxxxxxx>,nbhandari@xxxxxxxxxxxxxxxxxxx, doug@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 9 May 2002 08:58:12 -0400
Sorry everyone I forgot the links
1. 5 Gb/s presentation
http://www.amp.com/simulation/files/papers/DC00BRDH.pdf
4. DesignCon 2002 - Tyco / Gennum - 10 Gb/s Serial over FR-4
http://www.tycoelectronics.com/prodimages/DC2002_Tyco_Gennum.pdf
John
-----Original Message-----
From: David Johnson [mailto:djohnson@xxxxxxxxxxxxxx]
Sent: Wednesday, May 08, 2002 6:57 PM
To: nbhandari@xxxxxxxxxxxxxxxxxxx; doug@xxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Stub Definition
Doug,
A stub is a section of unterminated transmission line branching
off the transmission line of interest. Actually the branch line is
terminated in an open circuit.
Dave
-----Original Message-----
From: Nitin Bhandari [mailto:nbhandari@xxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, May 08, 2002 3:32 PM
To: doug@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Stub Definition
Hi Doug,
Generally speaking, if the stub length is less then 1/6 of the
electrical
length of the signal edge, then the stub can be treated as a lumped
element
instead if a distributed element. How much lumped (or distributed)
discontinuity is too much depends on your application as Mike suggests.
Regards,
Nitin
-----Original Message-----
From: Michael_Greim@xxxxxxxx [mailto:Michael_Greim@xxxxxxxx]
Sent: Wednesday, May 08, 2002 3:17 PM
To: doug@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Stub Definition
Hi Doug,
Some of the papers done by amp, teradyne,
etc regarding via effects on Ghz level signalling
show that even the stub length of the via can
have a big impact. This is part of the reason
behind counterboring the via to remove this stub
length.
I think that like most things in signal integrity
land, I suspect that the answer to this will be=20
'It depends'. Depending on how many you have, how
long they are, where they are and how fast you are=20
running will all have an effect on how long is long.
Just my 0.02
MG
-----Original Message-----
From: Doug Brooks [mailto:doug@xxxxxxxxxx]
Sent: Wednesday, May 08, 2002 4:55 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Stub Definition
This may be too simple a question for this high-powered group!
Is there an agreed upon definition for the word "stub" as in the case
of a=20
stub on a PC board?
Is there an agreed upon length beyond which a stub becomes a problem?
Doug Brooks
_____________________________________________________________________
UltraCAD Design, Inc. Celebrating 10 years of design excellence!=20
http://www.ultracad.com
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