Phase noise is the frequency domain representation of rapid, short-term, random fluctuations in the phase of a wave, caused by time domain instabilities ("jitter").An ideal oscillator would generate a pure sine wave. In the frequency domain, this would be represented as a single line at the oscillator's frequency, i.e., all the signal's power is at a single frequency. All real oscillators have phase modulatednoise components. The phase noise components spread the power of a signal to adjacent frequencies, resulting in sidebands.
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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.
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