RE: [SI-LIST] : x-talk saturation

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From: Peterson, James F (FL51) (james.f.peterson@honeywell.com)
Date: Tue Aug 22 2000 - 04:28:47 PDT


This is a re-send - again. I can't figure out why my SI-List mail sometimes
doesn't get reflected....
(The subject below has already been answered, I'm re-sending just to see if
this gets out.) -Jim

-----Original Message-----
From: Peterson, James F (FL51)
Sent: Monday, August 21, 2000 8:44 AM
To: 'opamps cybernetics'; si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : x-talk saturation

Hello -

I believe the statement you make below is not quite correct. Two very long
parallel conductors will saturate at a certain length, but it is not
necessarily forward crosstalk. Remember that forward crosstalk will usually
be small because the inductive and capacitive levels are opposite and thus
cancel each other out. When it is stated that after a certain length of
parallelism crosstalk saturates, it is talking about overall crosstalk, and
that is dominated by reverse crosstalk. The reason reverse crosstalk "levels
off" is because as the wavefront propagates away from the source, the
reverse crosstalk takes longer to get back - so the noise signal on the
victim doesn't grow in amplitude, but instead gets wider.
A rule of thumb (that seems solid to me) is that max. amplitude of reverse
crosstalk will occur at Tr/(2Tpd) of coupled length. (With a rise time of
1ns, and a prop. time of 2ns/12in., crosstalk reaches a max. amplitude at 3
inches of parallelism.)

hope this helps.
Jim
Jim Peterson
james.f.peterson@honeywell.com
Honeywell Space Systems
M/S 934-5
13350 U.S. Hwy 19 N.
Clearwater FL, 33764-7290
Office : 727-539-2719
Fax : 727-539-2183

   

-----Original Message-----
From: opamps cybernetics [mailto:opamps@hotmail.com]
Sent: Sunday, August 20, 2000 5:22 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : x-talk saturation

Hi,

If you have two very long parallel conductors, the forward cross-talk does
not increase in amplitude after some point (saturation). Can anybody
enlighten me why this saturation happens?

Opamps
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