CHAPTER 8Transmission Lines and Reflections
Reflections and distortions from impedance discontinuities can cause false triggering and bit errors. Reflections from impedance changes are the chief root cause of signal distortions and degradation of signal quality.
In some cases, this looks like ringing. The undershoot, when the signal level drops, can eat into the noise budget and contribute to false triggering. Or, on a falling signal, the peak can rise up above the low-bit-threshold and cause false triggering. One example of the reflection noise generated from impedance discontinuities at the ends of a short-length transmission line is shown in Figure 8-1.
Figure 8-1 “Ringing” noise at the receiver end of a 1-inch-long controlled-impedance ...
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