Phase noise
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In an oscillator, phase noise is rapid, short-term, random fluctuations in the phase of a wave, caused by time domain instabilities.
Phase noise, L(f) in decibels relative to carrier power (dBc) on a 1 Hz bandwidth, is given by:
- L(f) = 10log[0.5(S φ(f ))]
where S φ(f ) is the spectral density of phase fluctuations.
Source: Federal Standard 1037C