Agilent Technologies J-BERT N4903B Bedienungsanleitung PDF herunterladen (Seite 3)

Agilent N4916B Applications

Emulating transmitter de-emphasis

The de-emphasis signal converter N4916B allows emulating a transmitter by varying the

de-emphasis in a wide range and for each of the three cursors individually. The N4916B is

transparent to jitter on the data and clock signals from the pattern generator. The N4916B

outputs are DC coupled, so that even unbalanced pattern streams can be generated without

DC drifts.

Figure 2. Generating a de‑emphasis signal with N4916B and J‑BERT N4903B

Figure 3. Simplified block diagram of N4916B showing four‑tap FIR (finite impulse response) circuit

N4916B

Data in

De-emphasized data out

Clock in

Receiver (RX)Channel (CH)

Channel

RX latch

CDR

To BERT

analyzer

Device under test

Clock

J-BERT N4903B

Data out

Main-cursor

Post-cursor 2

Post-cursor 1

Pre-cursor

Data in

1UI

Clock in

1UI

1 1 1 1 1

8 Gb/s, 3 dB pre,- 6 dB post-cursor

1 00 0 0 0 0

1 2 3 4 5 6 7 8 9

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Agilent Technologies J-BERT N4903B Bedienungsanleitung Seite 3