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Single-ended TDR Measurements

Measuring Excess L/C

7-36

1 Change the

+ Position

until + marker is on the right side of the negative

bump.

2 Change the

X Position

until the X marker is on the left side of the negative

bump.

Figure 7-23

The excess L/C of the negative bump is 2.353307 pF. The negative bump is not

as well defined (or as square) as the positive bump. This is due to the filtering

effect that the positive bump (inductive section) has on the negative bump

(capacitive section). For example, the reflections off the capacitive section

have to pass back through the inductive section before it can be viewed. To get

a more accurate measure of the capacitive section, connect the cable to the

single transmission line closer to the wide trace.

+ Marker

X Marker

Excess L/C

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