[SI-LIST] Re: Some reference on reference planes
- From: hanymhfahmy@xxxxxxxxx
- To: "Mark Grobman" <markgrobman@xxxxxxxxx>,si-list-bounce@xxxxxxxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Mon, 7 Nov 2011 21:20:13 +0000
Hi Mark. Can u use reference traces around ur signal: route gnd n vcc as traces
around ur signal.
Sent via BlackBerry offered by Mobinil
-----Original Message-----
From: Mark Grobman <markgrobman@xxxxxxxxx>
Sender: si-list-bounce@xxxxxxxxxxxxx
Date: Mon, 7 Nov 2011 23:15:05
To: <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Some reference on reference planes
Hello experts,
I require some help on the subject of reference planes. I'm designing a
board and despite my best efforts i'm stuck with a situation where I'm
forced to conduct a signal using a stripline neither of whose planes are
the reference planes of the signal's driver (not the driver's ground or
VCC).
Now I know from various App. notes and books that this sort of situation
should be avoided and that I have been a bad engineer indeed.
Still, assuming the situation cannot be avoided I was hoping to get
some quantitative approximation to how bad of an idea this is.Sadly
speaking I don't have access to a 3d simulator which can give me exact
results so I'm going for best effort design methods. I would love to get
your input on the following issues:
1. Does the interference caused by not using the correct ref. planes carry
throughout the transmission line or does it occur only at the edges where
the current "jumps" back to the correct ref. planes?
2. Is there a merit figure of RiseTime/planes capacitance/???? for which
the situation isn't problematic?
3. Will using diff. lines improve the situation?
4. Suggested reading on the matter.
5. Highly insightful remarks which will blow my mind.
Cheers,
Mark
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