E2681A Datasheet, PDF (10/15 Pages) Keysight Technologies – EZJIT Plus Jitter Analysis Software

10 | Keysight | EZJIT Plus Jitter Analysis Software for Infiniium Oscilloscopes – Data Sheet
Deep memory captures low-frequency jitter
Deep memory is especially valuable for jitter analysis. The optional 2 Gpts memory on
the Keysight 90000 X-Series and 90000 Q-Series is helpful in measuring low frequency
jitter. At a sample rate of 80 GSa/s and incoming data rate of 2.5 Gb/s, 2 Gpts allows
you to capture jitter frequency components down to 40Hz. Comparably in the 90000A,
9000A, and 9000 H-Series, the 40 GSa/s sample rate and optional 1 Gpts memory
allows you to capture jitter frequency components as low as 40 Hz.
In some cases, measuring low-frequency jitter is not required; for example, the clock
recovery PLL in most serial data receivers can reject jitter very effectively at moderately
low frequencies. But sometimes an event occurring at a low repetition rate can cause
bursts of jitter or noise with higher frequencies that the PLL cannot reject.
For even deeper insight, apply the same deep analysis and component separation to the
vertical noise affecting your signal using Keysight’s N8813A EZJIT Complete software.
Figure 16. Use the measurement trend to remove spread spectrum clocks from your signal and make
measurements on it.