RE: [IBIS] Off-Diagonal Terms In Resistance Matrix

Yasser,
 
We included text in the ICM specification to address this very question.
Your first statement is almost correct: the off-diagonal entries relate
the voltage generated across one conductor to the current in others
(this induced current is due to EM field coupling, so I would not expect
to see this effect at DC except in some bizarre cases).  The specific
ICM text on mutual resistance is shown below, for reference.
 
Note that a value of zero ohms in the off-diagonal of a
[Resistance Matrix] does NOT imply a short circuit between
conductors. The off diagonal entries in resistance matrices
relate the voltage generated in one conductor to a current in
another. Using Ohm's law (V=I*R), an off-diagonal resistance
value of zero indicates the absence of resistive coupling
between the conductors.

You can find some good references on equivalent circuits for
off-diagonal mutual resistance terms through the web, or from your
nearest field-solver expert.

- Michael Mirmak
  Intel Corp.
  Chair, EIA IBIS Open Forum
________________________________

From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On
Behalf Of Yasser Sabry
Sent: Monday, August 27, 2007 6:15 AM
To: ibis
Subject: [IBIS] Off-Diagonal Terms In Resistance Matrix


Dear Experts, 
I'm a little bit confused about the physical meaning of the off diagonal
terms in the resistance matrix

Is it a mutual resistance such that a dc current flowing in one condutor
will cause a voltage on another conductor? 
Or it is just representing leakage current between conductor?

Then, what is  the equivalent circuit for such an off diagonal term in
the resistance matrix?

Thanks in advance, 
Yasser Sabry

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