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.
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