高速ディジタル信号の評価

概要

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The transmission quality of high-speed digital signals with Ethernet 100BASE-TX has been evaluated. It is shown that the deterioration of the signal quality is caused by the transmission loss which mainly originates on the resistance due to skin effects. The resistance due to skin effects is proportional to the square root of frequency. The frequency characteristics of the transmission loss are measured, and the approximate expression of the loss is derived. The eye patterns of high-speed digital signals with Ethernet 100BASE-TX are observed. The eye opening deteriorates after transmission through 40-100 m Unshielded Twist Pair cables. We simulate the waveforms after transmission using the approximate expression of the transmission loss. The simulated results are compared with the experiment result, and the waveform degradation is confirmed.
2013-01-31