Teledyne LeCroy QPHY-BroadR-Reach - Manual (Page 21)

QPHY-BroadR-Reach Software Option
Figure 12 – Transmitter Output Droop
Shown on this screen:
• F1 is the input differential signal which the measurements will be performed on
In the measurement section:
• T1 is the zero crossing time of the positive edge and t2 is the zero crossing time of the negative
edge.
• Vpk+ is the maximum value of input signal and Vpk- is the minimum value of input signal.
• Vdrooped+ is the value 500 ns after the maximum value and Vdrooped- is the value 500 ns after the
minimum value.
• Droop+ is the droop calculated on the +1 symbol and Droop- is the droop calculated on the -1
symbol.
• Q7 compares Droop+ to 26.9% and Q8 compares the Droop- to 26.9%.
Figure 13 – Transmitter Output Droop Test Results
922533 Rev B 21