Improving Time Domain Network Measurements
Removing Measurement Errors
10-10
To further verify the accuracy of the normalization, the response of the second
PCB is measured without the first PCB.
Figure 10-7
The unnormalized response of the DUT, measured without the test fixture
Example 2 Resolving two discontinuities separated by 2 mm.
Normalization can improve the TDR's ability to resolve adjacent discontinuities.
Figure 10-8 shows the TDR measurement results of two capacitive
discontinuities 2 mm apart in an air dielectric. Note that at a system risetime
slower than 45 ps, the two discontinuities appear to be one. By normalizing the
response to a system risetime of 10 ps, both discontinuities can be seen.
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