All, (and Radek, Brad and Vladimir in particular)
Scott McMorrow writes:
Circuit theory says that we can go from a partial element system where
ground and power loops are fully modeled to a ground referenced system
where node 0 ground is applied to every element in the path. But, ground
bounce inductance and resistance is then lumped into power circuit and
signal path circuits, and the discrimination between the these is lost.
From a differential node voltage perspective at the receiver, the result
is the same. The voltage between the signal and ground will remain the
same. If there is a difference, then somewhere in the circuit, the ground
partial inductance has not been reduced into the loop inductance for the
signal path and power paths.
It is a pretty standard transformation from partial inductance/resistance
matrices to loop inductance/resistance matrices, and is covered quite
extensively in Brian Young's book, which is still the best on the subject.
He's been at Motorola and TI. I believe he's at TI now running their ASIC
packaging group.
http://www.amazon.com/Digital-Signal-Integrity-Simulation-Interconnects/dp
/0130289043
Walter
Walter Katz
<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156
