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IEVref: | 561-03-22 | ID: | |

Language: | en | Status: Standard | |

Term: | phase noise | ||

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Definition: | 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, ${S}_{\varphi}\left(f\right)$, where the phase fluctuation function is $\varphi \left(t\right)=2\pi Ft-2\pi {F}_{0}t$. The spectral density of phase fluctuation can be directly related to the spectral density of frequency fluctuation by the following formula: $S}_{\varphi}\left(f\right)=\left(\frac{{F}_{0}}{f}\right){S}_{y}\left(f\right)\text{\hspace{0.17em}}{\text{rad}}^{\text{2}}\text{/Hz$ In the preceding formulae:
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Publication date: | 2014-11 | ||

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Note 1 to entry: This phase noise is normally expressed as the power spectral density of the phase fluctuations, ${S}_{\varphi}\left(f\right)$, where the phase fluctuation function is $\varphi \left(t\right)=2\pi Ft-2\pi {F}_{0}t$. The spectral density of phase fluctuation can be directly related to the spectral density of frequency fluctuation by the following formula:

$S}_{\varphi}\left(f\right)=\left(\frac{{F}_{0}}{f}\right){S}_{y}\left(f\right)\text{\hspace{0.17em}}{\text{rad}}^{\text{2}}\text{/Hz$

In the preceding formulae:

*F* is the oscillator frequency;

*F*_{0} is the average oscillator frequency;

*f* is the Fourier frequency.