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Evaluating Your Measurement Results
15
Problem Solving
accurately plot noise that exceeds the small angle line, select the
S
(f)
Spectral Density of Phase Modulation (dB/Hz) graph type (
).
φ
L(f)
raises the noise floor by 3 dB.
The –10 dB per 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 sideband of the phase modulation is still insignificant
compared to the power in the first order sideband. This ensures that
the calculation of cal L(f) is still valid.
L(f)
Figure 15-12
Is Only Valid for Noise Levels Below the Small Angle Line
Document Part No. E5500-90024Ed. 1.0
E5500 Phase Noise Measurement System Version A.02.00
15-17
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