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Probing a Differential Trace's Length
Midpoint
What are the effects of probing a differential trace
midway along the trace's length? At the probe's tip,
the TDR pulse splits into two parts traveling in
opposing directions away from the probe. To the
probe, it appears that two impedances are connected
in parallel. The net effect of probing in the middle of
traces are as follows:
■ The transmitted signal is greatly attenuated.
■ The reflected signal, as viewed and measured by
the TDR module, is greatly attenuated.
■ A large discontinuity appears in the line that sends
a reflection back to the source.
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