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Phase Noise Basics
4
What is Phase Noise?
Figure 4-3 Deriving L(f) from a RF Analyzer Display
L f ( )
is usually presented logarithmically as a spectral density plot of
the phase modulation sidebands in the frequency domain, expressed
in dB relative to the carrier per Hz (dBc/Hz) as shown in
Figure
4-4.
This chapter, except where noted otherwise, will use the logarithmic
L f ( )
S ∆ f f ( )
2f 2 L f ( )
=
form of
as follows:
.
Figure 4-4 L(f) Described Logarithmically as a Function of Offset Frequency
Document Part No. E5500-90024Ed. 1.0
E5500 Phase Noise Measurement System Version A.02.00
4-5
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