"Optimized Passive Infiniband Cable Equalizer Designs"

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Presented at DesignCon 2003, Santa Clara, CA Dr. Edward P. Sayre, III. Dr. Edward P. Sayre, P.E. Mr. Michael A. Baxter, B.S.E.E. Abstract 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. ->This paper is available from NESA for $15.00 to cover management costs. We accept credit card payment for purchase of the papers. The requested paper will be emailed to you shortly after your order is received.

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