Teledyne LeCroy QPHY-SAS3 - Manual (Page 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.
922545 Rev A 19