Teledyne LeCroy Eye Doctor II - Manual (Page 34)

Eye Doctor II Software
Case 1, without equalization.
Equalize the eye by enabling DFE and training it:
Case 1, with DFE equalization (at 100mV/div vertically).
DFE has the property of not actually boosting high frequency content and instead shifting its threshold
(to display an eye we actually shift each UI of the waveform relative to a fixed threshold), so DFE does not
emphasize high frequency noise.
The previous screen-shot shows the most open position of the eye is located at the horizontal center of
the screen, that is a result of DFE training. The clock phase is adjusted in this example by -11ps to achieve
the equalization.
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