JSA and CRE
Jitter Spectrum Analysis (JSA) and SW Clock Recovery Emulation (CRE), provides greater insights concerning jitter and improves measurement accuracy. JSA is available in Oscilloscope, Eye/Mask, and Jitter modes. In Jitter Mode, clock recovery emulation can be performed and a jitter spectrum graph is displayed that shows the spectral distribution of low-frequency jitter.
- Emulation of most clock recovery designs (1st or 2nd order, adjustable bandwidth and peaking) without hardware limitations.
- Improved compliance by better emulation of existing and future standards-based CR requirements.
- Better accuracy by removing non-ideal behavior of hardware clock recovery. For example, removing unwanted peaking that may artificially increase jitter results.
- Improved correlation to measurements performed by real-time scopes that employ software clock recovery.
Using Clock Recovery Emulation (CRE), you can configure JSA to observe the low-frequency jitter on the Input, Measured, or Emulated signal. In Jitter mode, you can also simultaneously and independently apply clock recovery emulation to optimize Jitter Mode's RJ measurement which is listed in the Jitter panel. For example, you can view the JSA results and spectrum for the Measured signal while applying CRE to optimize the standard Jitter-mode RJ measurement.
Jitter Mode requires the Research and Developement package license.
Option JSA requires FlexDCA version ≥A.01.70 and 86100D firmware version ≥A.10.70.
Before JSA measurements can be made, clock recovery must be locked.
Turning on the JSA Spectrum graph slows the display's update rate.