Teledyne-lecroy QPHY-SAS3 Manual de usuario descargar pdf (Pagina 19)

QPHY-SAS3 Software Option

QPHY-SAS3 TEST DESCRIPTIONS

Tx Group 1 Out of Band Tests 5.1.x (OOB)

There are 4 tests run in this group. The tests that are run are:

1. 5.1.1 – Tx Maximum Noise During OOB Idle

2. 5.1.2 – Tx OOB Burst Amplitude

3. 5.1.3 – Tx OOB Offset Delta

4. 5.1.4 – Tx OOB Common Mode Delta

After the completion of the Out of Band Tests the oscilloscope is in the following configuration:

Figure 9 - Oscilloscope Configuration after Out of Band Tests

Shown on this screen:

• F3 is the Idle Differential Signal. This trace represents only the idle portion of the differential OOB

signal.

• F4 is the Burst Differential Signal. This trace represents only the burst portion of the differential OOB

signal after it is filtered by a 4.5GHz low-pass Butterworth filter.

Having these two traces separate from each other allows us to perform the measurement on the idle

portion and the burst portion separately.

• F5 is the Burst Common Mode signal.

• F6 is the Wide Band AM Demodulated Differential Signal. This is used for the separation of the idle

portion from the burst portion.

• F7 is the Idle Common Mode signal. This is calculated by summing the two inputs and dividing them

by 2.

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Teledyne-lecroy QPHY-SAS3 Manual de usuario Pagina 19