in InterConnection Technology, October 1992
Mr. Michael A. Baxter, B.S.E.E.
Dr. Edward P. Sayre, P. E.
The accurate prediction of backplane impedance values is
an important step in the design, simulation and performance evaluation of
backplanes for high performance digital systems. For example, specific
knowledge of the impedance and propagation delay in FutureBus based designs
for various conditions of loading of the backplane bus is critical to the
prediction of timing relationships as well as the achievement of the
"clean" incident wave switching required by FutureBus device
designs. This paper provides the theoretical justification for the
application of the backplane capacitive loading formulas in determining
impedance and propagation delay and illustrates their use with a design
case study. The results are correlated to the more exact mixed transmission
line and discrete component SPICE simulated backplane model results and
measurements. The paper closes with some innovative applications of the
Scope54 automated measurement tool for quality control, parasitic
capacitive characterization and on-screen comparisons of FutureBus
backplane simulations and validations.
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