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Relationship between an S-parameter component corresponding to mode conversion and lumped parameters is investigated for high-speed differential copper cables using the theory of multi-conductor transmission lines. Experimentally observed frequency dependence of Scd21 is reproduced by analytical theories. Small fabrication tolerance is clarified.
The conventional copper cable has the intra-pair skew about 10ps/m, and it makes using the copper cable for the 25Gbit/s/lane difficult. For the purpose of reducing intra-pair skew, we analyzed the generation factor of the intra-pair skew about some cables. For this analysis, we converted the S-parameters of cables into the impulse responses and the step responses of each mode. As a result, in the...
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