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sampling clock generation are more often specified in terms of phase noise rather than time jitter. The purpose of this discussion is to develop a simple method for converting oscillator phase noise into time jitter.
Phase noise is the term used to describe measurements of the short-term fre-quency stability of these sources. This white paper provides a brief technical introduction to phase noise concepts as well as an overview of how phase noise is measured and reported.
In signal processing, phase noise is the frequency-domain representation of random fluctuations in the phase of a waveform, corresponding to time-domain deviations from perfect periodicity (jitter).
Associated with phase noise is time jitter of a signal, or simply jitter. Although variations in phase or time of a signal are equivalent, depending on the system, one is usually a more appropriate parameter to describe the resulting errors that are produced in the system.
8 lut 2017 · To begin understanding phase noise, here are some basic definitions of Phase Noise and what is known as Jitter. Phase Noise - The frequency domain representation of rapid, short-term, random fluctuations in the phase of a waveform, caused by time domain instabilities (jitter).
Phase jitter can be calculated by measuring the phase spectral density of the clock’s signal and integrating over a specific frequency band of interest. The area under the spectrum plot represents the power level of the phase modulating (jitter producing) noise, and the power of the noise is proportional to the RMS phase jitter squared.
What is Phase Noise? On the right, we see phasor diagrams of the amplitude, phase and single sideband modulation (SSB). LSB is the lower sideband and USB is the upper sideband. The gray vector indicates the resultant of the carrier.
