TIA's Glossary of Telecommunication Terms
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phase noise
In an oscillator, rapid, short-term, random fluctuations in the phase of a wave, caused by time-domain instabilities. Note: Phase noise, 
in decibels relative to carrier power (dBc) on a 1-Hz bandwidth, is given by = 10log[0.5(S 
(f ))] where S (f ) is the spectral density of phase fluctuations.