72 Keysight M8194A 120 GSa/s Arbitrary Waveform Generator User Guide
3 M8194A Soft Front Panel
• Set Default
All the waveform parameters are set automatically to their
corresponding default values.
• Abort
This button allows canceling signal calculation at any moment. It only
shows up during signal compilation.
Custom Modulation File Format
A custom modulation file is an ASCII delimited file including all the
information required to define a single carrier modulated signal based in
quadrature (IQ) modulation. The file should be composed of a header
including a series of lines with identifiers and parameters, and a list of
numerical correction factors. For lines including more than one item (i.e.
one identifier and one parameter), those must be separated using
commas. Identifiers and parameters are not case sensitive. These are the
significant fields for the header:
• #N: This is a mandatory field and it must be the first in the file. The N
parameter is the bits per symbol parameter. 0<N<11.
• Offset: It indicates if the Q component must be delayed by half a
symbol time respect to the I component. Accepted parameters are ‘yes’
or ‘no’. This parameter is optional. It defaults to ‘no’ if not included in
the file.
• Rotation: It sets the rotation of the constellation for each consecutive
symbol in degrees. This parameter is optional. It defaults to 0.0 if not
included in the file.
• RotMode: Rotation mode. Parameter may be ‘cont’ (continuous) or ‘alt’
(alternate). This parameter is optional. It defaults to ‘cont’ if not
included in the file.
• Vsb: It indicates that vestigial side band baseband filtering must be
applied. Accepted parameters are ‘yes’ or ‘no’. This parameter is
optional. It defaults to ‘no’ if not included in the file.
The order of the above entries is not relevant except for the ‘#N’ field that
must be placed first in the file. The symbol location section starts with a
line including the ‘IQ’ characters (not case-sensitive). Entries in this section
are made by IQ pairs separated by commas. The number of entries must
be at least 2N although additional entries will be ignored. Data to symbol
mapping depends on the order of the symbols in the file so its position
expressed in binary format corresponds to the binary code assigned to that
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