80 Keysight M8194A 120 GSa/s Arbitrary Waveform Generator User Guide
3 M8194A Soft Front Panel
• Inverted
This check box (if selected) reverses the polarity of the output
waveform. Default state is unselected.
• Data Section
The sequence of data to be generated can be set up in this tab. To do
so, the following control are available:
• Source
This drop-down list allows the selection of different pseudo random
binary sequences as data sources for signal generation. Choices are
PRBS 27-1 (Polynomial x7+x6+1), PRBS 29-1 (Polynomial x9+x5+1),
PRBS 210-1 (Polynomial x10+x7+1), PRBS 27 (Polynomial x7+x6+1),
PRBS 29 (Polynomial x9+x5+1), PRBS 210 (Polynomial x10+x7+1),
PRBS 211 (Polynomial x11+x9+1), and PRBS 215 (Polynomial
x15+x14+1). The sequences are identified by its non-repeating
length. The 2x sequences add an extra ‘0’ to the longest sequence of
consecutive ‘0’ in the corresponding 2x-1 sequence.
• Seq. Length
This edition field may be used to set a given data length to be
implemented by the modulated signal. This field defaults to the
maximum non-repeating length of the selected PRBS. It also
defaults to this value if the user types ‘0’ (Zero). Otherwise, the
sequence will be truncated when the number of bits set by this
control is reached. If this number is longer than the PRBS maximum
length, the sequence will be re-started as many times as necessary.
The actual number of symbols (and record length) in the waveform
memory will depend on the line coding/modulation and record
length granularity requirements. The simultaneous generation of a
clock signal can also influence on the actual sequence length as an
integer number of clock cycles must be accommodated to keep its
integrity (i.e. ISI distortion free characteristics).
• Seq. Shift
This numeric edition field adds a shift to the PRBS sequence being
generated by each channel. In this way, uncorrelated data streams
may be generated to simulate multi-lane links (i.e. to test the effects
of crosstalk) or to emulate IQ baseband channels to feed electrical
or optical coherent quadrature modulators. The shift added to each
channel may be calculated (in bits) for each channel using the
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