Agilent Technologies DisplayPort Manual do Utilizador descarregar pdf (Página 55)

Agilent Technologies, Inc.

DisplayPort Test Implementation Group 55 Agilent J-BERT N4903B & 90000A/X/Q Series Sink Draft2

Figure 59: Activate De-Emphasis Mode for Aux Data Output

ISI Adjustment Procedure

a. Set up J-BERT N4903B and scope according to section 9.1

b. Set de-emphasis to 0dB

c. Select the first J20 trace which leads to an ISI number higher than the target value

d. Measure ISI according to B appendix

e. Increase post cursor until ISI measurement is within target range. The post cursor should not

exceed -6dB.

Figure 60: ISI Adjustment by Applying De-Emphasis

Note: In above example -0.8dB would result in ISI in the middle of the target range

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Agilent Technologies DisplayPort Manual do Utilizador Página 55