Teledyne LeCroy QPHY-USB3-Tx-Rx - Manual (Page 28)

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917719 Rev A
On this screen (shown previously) 1 trace is visible. This is the SSCTrack of the captured waveform.
The minimum and maximum of the SSC Track is measured in P1 and P2. The frequency of the SSC Track is
measured in P3.
Figure 13 - Test Report from SSC Tests
Test 1.3 Jitter & Eye Diagram Test
Test 1.3.1 Jitter
The purpose of this test group is to verify that the jitter is within the specification limits. For compliance testing the
measurements are made after a compliance channel after applying the referenc e Continuous Time Linear
Equalizer (CTLE) function. Measuring the jitter is a multiple step process . First, the jitter must be measured while
the PUT is transmitting the CP1 (101010) pattern. Then, the jitter is measured while the PUT is transmitting the
CP0 (scrambled D0. 0) pattern, however the random jitter (Rj) that was measured during the jitter test of CP1 must
be injected into this measurement. This simplifies the separation of random (Rj) and deterministic jitter (Dj) since
there is no data depending jitter (DDj, a component of Dj) when CP 1 is transmitted.
At the completion of the CP 1 Jitter Test the oscilloscope is in the following configuration:
Figure 14 - Oscilloscope Configuration after CP1 Ji tter Test
On this screen there are 2 traces visible. They are the TI E Hi stogram and the Bathtub Curve. Also, the Tj, Rj
(spectral) and Dj (spectral) are display ed in the S DA Jitter section.
Additionally the minimum pulse widt h in the acquired waveform is measured in P1.