Teledyne-lecroy QPHY-SAS3 Manuale Utente Scaricare il pdf (Pagina 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:

http://www.teledynelecroy.com/files/WhitePapers/Understanding_SDAIII_Jitter_Calculation_Methods.pdf

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Teledyne-lecroy QPHY-SAS3 Manuale Utente Pagina 30