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Phase Noise and Jitter Measurements

May 27, 2015



Originally presented at DesignCon 2013.

Jitter is a very important topic in signal integrity for high speed serial data links. The jitter performance of clock signals used in generating the serial data signal is critical to the overall performance of these signals.

Phase noise is the most sensitive and accurate measurement of the performance of precision clocks.

This presentation covers the theory and practice for making phase noise measurements on clock signals as well as the relationship between phase noise and total jitter, random jitter and deterministic jitter. Measurements on a typical clock signal is also included.

For more information, visit or call (888) 837-8772 to speak to a local Rohde & Schwarz expert.

  • 1. Phase Noise andJitter Measurements

2. Phase Noise and Jitter MeasurementsIntroduction Rick Daniel Application Engineer Rohde & Schwarz Colorado Springs, CO DesignCon 2013 | Phase Noise and Jitter | 2 3. Agenda Jitter Review Time-Domain and Frequency-Domain Jitter Measurements Phase Noise Concept and Measurement Deriving Random and Deterministic Jitter from Phase Noise PLL/Filter Weighting of Jitter Spectrum Calculating Peak-to-Peak Jitter from RMS JitterDesignCon 2013 | Phase Noise and Jitter | 3 4. What is J ii tt tt e rr ?Je Jitter is the short-term time-domain variations in clock or data signal timing Jitter includes instability in signal period, frequency, phase, duty cycle or some other timing characteristic Jitter is of interest from cycle to cycle, over many consecutive cycle, or as a longer term variation Jitter is equivalent to Phase Noise in the frequency domain Variations with frequency components >10Hz are Jitter Variations with frequency components

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