05 | Keysight | N4960A Serial BERT 17 and 32 Gb/s - Data Sheet
N4951B-D17/-D32 pattern generator with 5-tap
de-emphasis remote head
The N4951B-D17/-D32 de-emphasis options provide integrated 5-tap de-emphasis
(1 pre-cursor, 3 post cursors) and are available in 17 Gb/s and 32 Gb/s versions. The
de-emphasis head provides designers with the signal pre-distortion capability required
for transmitter emulation and equalization when characterizing receivers, backplanes,
and systems.
Figure 5. No de-emphasis.
Figure 6. De-emphasis equalization applied.
Simplify tap weight computation
The N4980A Multi-instrument BERT software includes a powerful de-emphasis tap
weight computation tool that simplifies the process of computing tap weights, reducing
the time required to a few seconds. Starting from a measured or simulated S-Parame-
ter file of the data path to be equalized, the software calculates the optimum tap values
necessary to create the ideal compensation filter response. The user can control tap
configurations, so different solutions with different ranges of pre- and post-cursors can
be synthesized. Once the data has been analyzed and desired results obtained, a single
click loads the computed tap weights directly into the N4951B-D17/-D32 pattern gener-
ator head.
Figure 7. De-emphasis tap weight calculator.
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