Keysight M8000 Series of BER Test Solutions User Guide 343
Setting up Analyzer 6
10 In this example the received signal is a PAM4 signal with a peak
amplitude of 150 mV and completely closed eyes. The auto alignment
reports eye heights of 10 mV, 9 mV and 13 mV in the logger (Utilities >
Logger) for an alignment BER threshold of 1e-9. At the end of the auto
alignment, the sampling point setup will draw a schematic eye
diagram that gives an indication of the eye opening at the configured
alignment BER threshold.
The above figure shows the calculated threshold values and the black area
at the sampling point shows the total eye opening achieved after applying
equalization.
The alignment BER threshold defines the BER level that is used by the
auto-alignments to determine the inner eye opening as shown in the
sampling point setup. The inner eye opening at the alignment BER
threshold is used to calculate the optimum sample delay and threshold
voltages. Lower values result in a more precise sampling point,
especially when the eye opening is small.
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