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RIGOL
To Output Advanced Waveform
DG2000 provides three advanced waveforms: PRBS, RS232, and Sequence.
Note:
When one channel is set to one of the advanced waveforms, the other
channel will automatically switch to the set advanced waveform from other
waveform.
PRBS
A PRBS is generated by a linear-feedback shift register (LFSR), as shown below.
1
2
3
4
An LFSR is specified by the number of stages it contains (L) and which stages (taps)
feed the exclusive-or (XOR) gates in its feedback network. The PRBS output is taken
from the last stage. After selecting proper taps, an L-stage LFSR produces a
repetitive PRBS of length 2
of PRBS.
When the Shift key is illuminated, press Home/Menu → Advanced → "PRBS" to
open the PRBS parameter setting interface.
1.
Bit Rate: sets the output bit rate of the PRBS waveform.
2.
Ampl/HighL: sets the output amplitude/high level of the PRBS waveform.
3.
Offset/LowL: sets the output offset/low level of the PRBS waveform.
4.
Data: selects the data type of the PRBS waveform to PRBS7, PRBS9, PRBS11,
resulting in sequences of 127, 511, and 2047 bits in length. By default, it is
PRBS7.
Please refer to "To Output Basic Waveform" to configure the parameters and
output for the channel.
2-30
XOR
5
6
7
-1. The clock frequency of LFSR determines the "bit rate"
L
Chapter 2 Front Panel Operations
8
9
PRBS
DG2000 User Guide
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