PAM Eye Skews
The Eye mode PAM Eye Skews measurement measures the skew (seconds or UI) of each of the three eyes of a PAM4 eye diagram relative to the average center time of all eyes. On NRZ signals, this measurement measures the time at the center of the single eye.
|PAM-N Analysis Setup Dialog Box Settings|
|Receiver Sample Timing||Configures the timing for sampling the signal data for all PAM measurements in Eye/Mask mode.|
|Eye Center Location||Selects the basis for determining the location of an eye's center on the waveform: at maximum eye width or maximum eye height.|
|Eye Level Width||Defines the timespan (in percentage of symbol width) over which an eye's amplitude level is measured.|
|Time Units||Sets the time units for measurement: seconds or unit intervals.|
The skew of each eye is calculated by:
- For each eye, determine the time at the eye's center, which is the time at the measured eye height. Eye height is affected by the Eye Opening Probability setting.
- Calculate the average time of all eyes.
- Skew for each eye is the time of the eye relative to the average time calculated in step 2.
- Display the measurements in the units specified in the Time Units setting.
This measurement can be applied to both PAM4 and NRZ waveforms.
- Select Eye/Mask Mode.
- Click Auto Scale in the menu toolbar.
- Click the toolbar's PAM tab.
- On the toolbar, locate and click the Eye Skews button.