Approximate Sensitivity Of Delay Line Discriminator - Agilent Technologies e1420b User Manual

Phase noise measurement system

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Approximate Sensitivity of Delay Line Discriminator

The dependence of a frequency discriminator's sensitivity on the offset

frequency is obvious in the graph in

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

1/2πτ. 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

E5505a_delay_line_discr

02 Mar 04 rev 1

Figure 292 Delay line discriminator sensitivity

( f ) = -[dBc/Hz] vs. f [Hz]

292. By comparing the sensitivity

Agilent E5505A User's Guide