Main Page | See live article | Alphabetical index 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 This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.