| frequency-domain measure of the short-term frequency stability of an oscillator|
Note 1 to entry: This phase noise is normally expressed as the power spectral density of the phase fluctuations, , where the phase fluctuation function is . The spectral density of phase fluctuation can be directly related to the spectral density of frequency fluctuation by the following formula:
In the preceding formulae:
F is the oscillator frequency;
F0 is the average oscillator frequency;
f is the Fourier frequency.