Teledyne LeCroy QPHY-SAS3 User Manual
Page 30
Figure 23 - Oscilloscope Configuration after the Rj and Tj Tests
Shown on this screen:
• F1 is the differential input waveform.
• RjBUjHist is the histogram of the random and bounded uncorrelated jitter. This is the same as the
full TIE histogram with the DDj removed. The RjBUjHist is an output from SDA III.
To comply with the JTF requirements when SSC is not enabled a single-pole PLL is used in SDA III and
when SSC is enabled a two-pole PLL is used. The PLLs have the following characteristics:
Without SSC Support
With SSC Support
Pole Frequency
Zero Frequency
Natural Frequency
Damping Factor
1.5Gbps
1.7MHz
50MHz
2.1MHz
0.86
3Gbps
3.2MHz
50MHz
3.0MHz
0.85
6Gbps
5.6MHz
50MHz
4.2MHz
0.85
12Gbps
5.5MHz
50MHz
4.2 MHz
0.85
Note: For more information on SDA III refer to the Understanding SDA III Jitter Calculation Methods technical brief
available at the following address:
30
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