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17
Reference Graphs and Tables
Phase Noise Floor and Region of Validity
Phase Noise Floor and Region of Validity
Figure 17-2
17-4
E5500 Phase Noise Measurement System Version A.02.00
Caution must be exercised when
density of the phase fluctuations,
criterion. The -10 dB/decade line is drawn on the plot for an
instantaneous phase deviation of 0.2 radians integrated over any one
decade of offset frequency. At approximately 0.2 radians, the power
in the higher order sidebands of the phase modulation is still
insignificant compared to the power in the first order sideband
which ensures the calculation of
Figure
17-2, below the line the plot of
L(f)
is increasingly invalid and
phase noise of the signal. (
L(f)
line. When using the
Level.
S
(f) = 2 (L(f)) or S
φ
L(f)
is calculated from the spectral
S
(f)
because of the small angle
φ
L(f)
is still valid. As show in
L(f)
is correct; above the line,
S
(f)
must be used to represent the
φ
S
(f)
is valid both above and below the
φ
S
graph to compute
φ
(f)
= L(f)
+ 3 dB
φ
dB
dBc
Document Part No. E5500-90024 Ed. 1.0
(f)
, add 3 dB to the
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