Teledyne LeCroy QPHY-MOST50 - Manual (Page 20)

20
920457 Rev B
Transfer Jitter Testing 1.2, 2.2
This test is performed at points SP1E and SP2E. The oscilloscope captures a long signal record
which is used to generate a TIE-track where the PLL from the clock recovery is set to a very low
frequency. This TIE-track is then filtered by the specified filter. The filter is implemented as an IIR
Butterworth filter for best conformance to the standard. The transfer jitter value is the RMS (sdev) of
this filtered TIE-track.
Figure 12 - Oscilloscope Configuration after the Transferred Jitter Test
Shown on this screen:
• F2 is a TIE-track of a long captured record where the PLL from the clock recovery is set to a very
low frequency. This TIE-track is then filtered by an IIR Butterworth filter.
Figure 13 - Transferred Jitter Test Results
In the measurement section:
• P1 is the transfer jitter value calculated by the RMS (sdev) of this filtered TIE-track.