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With the speed of the conventional parallel data communication increases, the transmission delay has been difficult to accurately control, so the High-speed serial data transmission become the main form of communication, When the data rate over Gb / s level, the clock signal introduced jitter has become a major component of the system jitter, Low data rate jitter analysis techniques have been difficult to meet the requirements, phase noise measurement technology provides solutions in high-speed serial data link jitter analysis. This article taking the examples of the calculation method by phase noise measurements indirect measure jitter, and discusses the relationship between the phase noise and jitter from the principle.discusses the relationship between the phase noise and jitter in principle.