332 N5511A Phase Noise Test System User’s Guide
Reference Graphs and Tables
Approximate Sensitivity of Delay Line Discriminator
Approximate Sensitivity of Delay Line Discriminator
The dependence of a frequency discriminator's sensitivity on the offset
frequency is obvious in the graph in
. By 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.
Figure 16-5
Delay line discriminator sensitivity
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