f1
f2
Phase Noise Plots With Phase Noise Impairments
−50 dBc/Hz
−50 dBc/Hz
Flat mid–frequency offset
(Lmid)
characteristics
No additive
phase noise
Resultant phase
noise plot
When turned on, this phase noise is added
to the base phase noise of the signal
generator.
Even though it is only the mid–frequency
characteristics placement that are modified,
these changes affect the entire phase noise
shape. The close in and far out offset
characteristics change by exhibiting
approximately a 20 dBc/Hz slope for each
octave of frequency offset.
The resultant phase noise plot shown on the
left has the following settings:
— f1 = 100 Hz
— f2 = 1 kHz
— Amplitude (Lmid) = –70 dBc
The frequency values entered for the impairments may not be the exact values when
viewed on the RF output. The entered values are guidelines that the signal generator uses
to calculate the real values. See “Understanding the Phase Noise Adjustments” on
page 335 for more information.
−50 dBc/Hz
−50 dBc/Hz
Signal generator front panel plot:
— f1 = 100 Hz
— f2 = 1 kHz
— Lmid = –70 dBc
Ensure that the f1 value is less than or equal
to f2. If not, f2 changes its value to match
f1. Conversely if f2 is set to a value that is
less than f1, f1 changes its value to match
f2.
100 Hz
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