The five common power-law noise processes in precision oscillators are:
(White PM)
(Flicker PM)
(White FM)
(Flicker FM)
(Random-walk FM)
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Frequency - Phase - Time Relationships
S. R. Stein, "Frequency and Time - Their Measurement and Characterization," in E. A. Gerber and A. Ballato, Precision Frequency Control, Vol. 2, pp. 191-232, Academic Press, 1985.