[SI-LIST]

From: "Albert Ruehli" <ruehli@xxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Date: Thu, 27 Sep 2001 14:23:08 -0400


I just looked at the discussion  by Larry Smith and by Michael Tsuk
on where the ground should be placed in electrical models.
 Where the ground should be in a model is definitely a nontrivial
question.   As Michael points out, PEEC models can be used to compute
loop inductances.  Depending on the application we do or do not want to
ground one of the nodes in the model.    For example, for an inductance
only model we need to ground one node, else the model floats.  So
we have a multi-loop situation where one or more of the loops have
a grounded terminal to avoid floating circuits.     For high
frequency PEEC models the capacitances take care of the problem and
then ground corresponds to the node at infinity.   Then we can measure
voltages as potential differences which makes sense.   There are many
more different situations where the best solution depends on other
aspects like the connected circuits.
 Al

Regards,
Albert Ruehli
ruehli@xxxxxxxxxx
914-945-1592  TL  862-1592, Fax  914-945-4244


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