Agilent Technologies J-BERT N4903B Uživatelský manuál stáhnout pdf (Strana 4)

Agilent N4916B Applications

Transmitter (TX) Receiver (RX)Channel

ChannelTX latch

TX PLL

RX latch

CDR

RX PLL

Clock Clock

Reference

Clock

No TX de-emphasis Closed eye at receiver input

With TX de-emphasis Open eye at receiver input

Signal before channel Signal after channel

Figure 4. De‑emphasis helps to compensate for the signal degradations caused by the channel.

Also some of the signal degradations caused by cables, fixtures or test boards in the test setup

can be compensated for using de‑emphasis.

De-embedding signal degradations

The N4916B can also be used to compensate for some of the signal degradations caused

by the test set up; e.g. cables, fixtures, test boards. This is helpful to optimize the jitter

budget needed for accurate receiver tolerance characterization.

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Agilent Technologies J-BERT N4903B Uživatelský manuál Strana 4