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application note
Guidelines for Designing High-Speed FPGA PCBs :
Time domain reflectometry (TDR) is a way to observe discontinuities on
a transmission path. The time domain reflectometer sends a pulse
through the transmission medium. Reflections occur when the pulse of
energy reaches either the end of the transmission path or a discontinuity
within the transmission path. From these reflections, the designer can
determine the size and location of the discontinuity. Many examples in
this handbook use TDR, and this section provides an understanding of
TDR.
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