Agilent Technologies DisplayPort Manuel d'utilisateur télécharger pdf (Page 44)

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DisplayPort Test Implementation Group 44 Agilent J-BERT N4903B & 90000A/X/Q Series Sink Draft2

Figure 41: RBR ISI measurement step 2 for jitter with ISI

In this example the hist

pp no ISI

measurement was 58.9ps and the hist

pp with ISI

measurement was 406.7ps.

The delta is 347.8ps or 563.4mUI. The target limits are 570mUI+-5%.

Eye Height Measurement for RBR

A vertical histogram which slices through the one level and one for the zero level are used to measure eye

height boundaries for the zero level and one level. The delta is the eye height. The scope is triggered by a

signal from J-BERT’s clock or trigger output.

Scope settings:

• Set scope up for a measurement on a differential signal either by using a differential SMA probe head

or HW based channel subtraction (channel 1-3 or channel 2-4)

• Use 1kpts acquisition depths

• Set display mode to color grade

• Adjust eye in the center of the display

• Activate a vertical histogram Analyze ! Histogram and slice thinly through the one level starting in

the center of the eye for the one level boundary and change the window in the voltage axis to slice

through the zero level starting from the center of the eye for the zero level boundary

• Activate an histogram peak to peak measurement

The measurements for one level and zero level boundaries need to be done with the same left and right

limits for the histogram window to get the eye height for a specific timing setting.

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Agilent Technologies DisplayPort Manuel d'utilisateur Page 44