Discussion
What is meant by an oscillator's phase noise?
Answer: C
Phase noise is the random fluctuation of the output's phase, seen as skirts either side of the carrier in the spectrum and as jitter in the time domain. Harmonic content is distortion, slow drift is a stability specification measured over minutes or hours, and amplitude variation is a separate impairment. The three describe different imperfections on different time scales, and a source can be excellent on one and poor on another - which is why a data sheet quotes all three.
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