All-
To quote Heidi Barnes (and possibly others) "ground" is for potatoes and
carrots.
Rather than referring to "Local Ground", I request that you refer to a
"local return node" as a single point on the current return path for a
given circuit node. Even this concept is an engineering approximation;
however this approximation can at least be rigorously defined. Given a
signal node and its corresponding local return node, the only voltage
that is defined is the voltage difference between the signal node and
the local return node; and that's enough information to solve even a
complex high frequency circuit. Tautologically speaking, it is true that
the voltage difference between the local return node and itself is 0.0V;
however, that isn't a very useful observation.
Mike Steinberger
On 1/17/2017 4:13 PM, Walter Katz wrote:
All,
I think that IBIS should simply state:
All voltage measurements at a buffer shall be made relative to a “Local Ground” node.
The “Local Ground” is defined as any Rail Terminal that has a value of 0.0 volts in DUT conditions.
·If there is no Rail Terminal that has a value of 0.0 volts in DUT conditions, then
oA component pin rail signal name that has a 0.0V DUT value, then that signal name shall be “Local Ground”.
§If there is no component pin that has a DUT value of 0.0V, then simulator Node 0 shall be the reference voltage for all voltage measurements.
Walter
Walter Katz
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Phone 303.449-2308
Mobile 303.335-6156