Chapter 9. Lossy Lines, Rise-Time Degradation, and Material Properties
A signal with a very fast edge going into a real transmission line will come out with a longer rise time. As an example, the measured response of a 50-psec signal transported through a 36-inch-long, 50-Ohm backplane line in FR4 is shown in Figure 9-1. The rise time has been increased to almost 1 nsec. This rise-time degradation is due to the losses in the transmission line and is the dominant root cause of intersymbol interference (ISI) and the collapse of the eye diagram.
Figure 9-1 Measured input and output signals through a 50-Ohm line, 36 inches long. A 50-psec rise-time signal goes in, while a 1-nsec risetime signal comes out.
Loss in transmission lines is the principal ...
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