How to Measure Phase Noise with a Real Time Oscilloscope

An oscilloscope may also simply be good enough for the measurement requirements if your budget doesn’t allow for a dedicated instrument for measuring phase noise.

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Before describing how to measure phase noise using an oscilloscope it would probably be a good idea to ask “why use a real time scope for this kind of measurement?” There are instruments dedicated to the measurement of phase noise such as the Keysight E5052B Signal Source Analyzer which have a much lower phase noise measurement floor than any oscilloscope. However there are typically some measurement restrictions such as limits on the maximum frequency offset range available. 100 MHz is a typical maximum offset for a phase noise analyzer. For clock frequencies greater than 100 MHz it may be desirable to measure out to higher frequency offsets than can be measured with these tools. Also an oscilloscope can measure the phase noise transferred onto a data signal, not just on a clock.

Learn more at these blog posts (link to part 2 at bottom of post): https://community.keysight.com/community/keysight-blogs/oscilloscopes/blog/2016/11/02/measuring-phase-noise-with-a-real-time-sampling-oscilloscope-part-1

The oscilloscope used in this video was a Z-Series oscilloscope. You can learn more here at the Z-Series product page: http://www.keysight.com/en/pcx-x205212/infiniium-z-series-oscilloscopes?cc=US&lc=eng

Learn more about using oscilloscopes: http://oscilloscopelearningcenter.com

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