NationMaster - Encyclopedia: Phase noise

Vectron Products - Phase Noise (1159 words)
	Phase noise is measured in the frequency domain, and is expressed as a ratio of signal power to noise power measured in a 1 Hz bandwidth at a given offset from the desired signal.
	Noise relatively close to the carrier (Region A) is called Flicker FM noise; its magnitude is determined primarily by the quality of the crystal.
	The phase noise test characterizes the output spectral purity of an oscillator by determining the ratio of desired energy being delivered by the oscillator at the specified output frequency to the amount of undesired energy being delivered at neighboring frequencies.

Phase noise - Wikipedia, the free encyclopedia (73 words)
	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:
	(f) is the spectral density of phase fluctuations.

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