at DesignCon 2003, Santa Clara,
Dr. Edward P. Sayre, III.
Dr. Edward P. Sayre, P.E.
Mr. Michael A. Baxter, B.S.E.E.
This paper focuses on the performance results and design
rationale for the development of two optimized passive equalizer designs
for Infiniband cable use. Passive equalization is a low cost technique that
enhances either the transmission distance or the bit data rate for a given
cable wire gauge. This paper will discuss a simple minimum cost 4-component
RC equalizer and a 6-component R-L-C source matched equalizer. A pass
through paddleboard was design during the development program using the
same controlled impedance requirements as the two equalizer designs.
This paper will introduce why equalization is needed to extend cable length
with a small cost impact. It will further discuss the design methodology of
using SPICE to create the design evaluations in terms of voltage vs. time
waveforms, eye-diagrams and frequency domain S-parameters. The design and
analysis of results are based on the appropriate Infiniband specification
sections. This design approach allows a flexible evaluation of parameters
resulting in an optimized set of designs which maximize the transmission
distance at Infiniband signaling rates.
Through this paper the technical audience will gain a solid understanding
of equalization, possible implementations and design methodologies and how
to verify that the designs meet high performance specifications.
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