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8
FN6981.1
November 19, 2009
Typical Performance Characteristics
VDD = 1.2V, TA = +25°C, unless otherwise noted. Performance was characterized using the system testbed shown in
Figure 1. Unless otherwise noted, the transmitter generated a non-return-to-zero (NRZ) PRBS-7 sequence at 800mVP-P (differential) with 10ps of peak-to-peak deterministic jitter. This transmit signal was launched into twin-axial cable test
channels of varying gauges and lengths. The loss characteristics of these test channels are plotted as a function of
frequency in Figure
2. The received signal at the output of these test channels was then processed by the QLx4600-SL30
before being passed to a receiver. Eye diagram measurements were made with 4000 waveform acquisitions and include
random jitter.
FIGURE 1. DEVICE CHARACTERIZATION TEST SETUP
FIGURE 2. TWIN-AXIAL CABLE LOSS AS A FUNCTION OF FREQUENCY FOR VARIOUS TEST CHANNELS
FIGURE 3A. JITTER vs CABLE LENGTH, 5Gb/s
FIGURE 3B. JITTER vs BOOST SETTING, 5Gb/s
FIGURE 3. JITTER VS CABLE LENGTH AND JITTER VS BOOST SETTING AT 5 GBPS
Pattern
Generator
SMA
Adapter
Card
100O Twin-Axial
Cable
SMA
Adapter
Card
QLx4600-SL30
Eval Board
Oscilloscope
Ω
TEST CHANNEL LOSS CHARACTERISTICS
0
0.1
0.2
0.3
0.4
0.5
4
8
12
16
20
24
28
Boost Setting
J
itte
r(
U
I)
Cable A (24AWG 20m)
Cable B (30AWG 12m)
Cable C (28AWG 20m)
QLx4600-SL30