Teledyne-lecroy QPHY-SAS3 Manuel d'utilisateur télécharger pdf (Page 27)

QPHY-SAS3 Software Option

Figure 19 - Oscilloscope Configuration after the Vpp, VMA, and EQ tests

Shown on this screen:

• F2 is Eye Diagram created from the input signal using a 2 pole PLL with a natural frequency of

3.9MHz and a damping factor of .800. This is shown for information only.

• F4 is a histogram of the input waveform.

• F5 is this histogram converted to a waveform (this is required to perform certain measurements on

the histogram).

• F6 is the differential input waveform. This is calculated by subtracting the negative input from the

positive input.

Figure 20 - Vpp, VMA and EQ Results

In the Measure section:

• Vpp (P1) is measuring the full range of the F4 histogram. This is the measured result for Tx - Vpp

(5.3.4). This value must be between 850mV and 1.2V in order to pass this test.

• LowMode (P4) is the maximum peak from the left side of the F5 waveform. This represents the de-

emphasized low voltage level of the signal.

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Teledyne-lecroy QPHY-SAS3 Manuel d'utilisateur Page 27