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Approximate Sensitivity of Delay Line Discriminator
Figure 17-5
Document Part No. E5500-90024Ed. 1.0
The dependence of a frequency discriminator's sensitivity on the
offset frequency is obvious in the graph shown in
comparing the sensitivity specified for the phase detector to the
delay line sensitivity, it is apparent the delay line sensitivity is
``tipped up'' by 20 dB/decade beginning at an offset of 1/2 πτ The
sensitivity graphs indicate the delay line frequency discriminator can
be used to measure some types of sources with useful sensitivity.
Longer delay lines improve sensitivity, but eventually the loss in the
delay line will exceed the available power of the source and cancel
any further improvement. Also, longer delay lines limit the maximum
offset frequency that can be measured.
E5500 Phase Noise Measurement System Version A.02.00
Reference Graphs and Tables
Approximate Sensitivity of Delay Line Discriminator
17
Figure
17-5. By
17-7
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