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SDG7000A User Manual
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133
Logic Level
Used to quickly set the amplitude to some standard levels. See table
9.4 for details
Length
PRBS-3 ~ 32 can be set, corresponding length (2
3-1
) ~ (2
32-1
)
Edge
Refers to the rise time of 10% ~ 90% and the fall time of 90% ~ 10%,
with the unit of s. Both rising and falling edges are set at the same
time
Table 9-4 Logic levels supported by PRBS
Logic level
Amplitude(Vpp)
Offset(V)
TTL/CMOS
5.00
2.50
LVTTL/LVCMOS
3.30
1.65
ECL
0.80
-1.30
LVPECL
0.80
2.00
LVDS
0.35
1.25
The preset logic levels in the table are valid only when output mode =
single ended.
Application example: set CH1 to output PRBS with the following parameters
Differential output, external differential load 100 Ω
Bit rate = 122.88 Mbps
Amplitude = 300 mVpp
Common Mode= 600 mV
Lengh is PRBS-7
Rise/Fall edge = 1 ns
1. In "Output Setting", set the output mode of CH1CH1 to "Differential" (see "single-end /
differential setting" for details), connect the "+" terminal of CH1CH1 to the "+" end of
the 100 Ω differential load, and the "-" terminal of CH1 to the "-" end of the 100 Ω
differential load
2. On the carrier parameter setting page of CH1CH1, set the "load" to 100 Ω.
3. Set the bit rate to 122.88 Mbps;
4. Set the amplitude to 300 mVpp and the offset to 0
5. Set “Common Mode” to 600 mV
6. Set “Length” to PRBS-7
7. Set ”Rise/Fall” to 1ns
8. Open the output
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