SNAA285 October 2015 LMK61E2
Phase Noise and Jitter are important metrics that describe the quality of a low-noise oscillator. Jitter is a time-domain representation of the timing accuracy of a signal and Phase Noise is the frequency domain representation of noise spectrum around the carrier tone. Equipment for measuring jitter in time-domain, such as real-time oscilloscopes, excel in their ability to directly measure period jitter, cycle-to-cycle jitter, TIE and data-dependent jitter which makes them an ideal choice for characterizing high speed serial links. Frequency domain equipment, such as a Phase Noise Analyzer, on the other hand, measures the RMS power of a signal in a frequency band of interest. Phase Noise Analyzers typically have a much lower noise floor than most real-time oscilloscopes making them an ideal choice for characterizing ultra-low jitter oscillators such as LMK61E2.