modes. Equally spaced tones are defined on the basis of their common parameters such
as start and stop frequencies, and tone spacing or number of tones or both. Arbitrarily
distributed tones are defined through a table. In order to simplify the creation of
complex scenarios, the tones defined in the equally spaced mode are loaded into the
tone table every time the user switches to the arbitrary mode and the tone table is
empty. In this way, any number of tones may be easily defined in the equally spaced
mode, and then the resulting table may be edited for frequency, amplitude, or phase for
each individual tone. Tones may also be deleted or added.
This tab has the following controls:
Waveform Destination Section
Generate I/Q Data
It is always selected while in up-converter modes. If selected in direct mode, it will
assign the I (In-phase) component to Channel 1 and the Q (Quadrature) component
to Channel 2.
2nd Nyquist Band Gen.
This checkbox must be selected for generation of signals in the second Nyquist
band (FS/2 – FS). Its effect depends on the signal generation mode. For direct
signal generation, it only has an effect if multi-tone correction is active. In this
case, amplitude and phase corrections will be applied to each tone according to
the location of the corresponding image in the second Nyquist band. For up-
conversion modes, the location of each tone is reversed in the frequency domain as
well as amplitude and phase corrections.
Channel
Independent checkboxes allow the definition of multi-tone waveforms for Channel
1, Channel 2, or both. One of the boxes will be always checked and checking both
is only possible when both channels are coupled (see Channel Coupling control in
Clock Tab).
Segment Number
Target segment for each channel can be defined independently.
Corrections Section
File…
Open a correction file selection dialog box. Default file extensions match the File
Format selection. The name of the successfully loaded correction factors file is
shown in the field located at the left of this button. The accepted format for
correction files may be found in the Correction File Format section.
Correction Mode
Correction files may contain data relative to the correction (magnitude and phase)
to be applied to the multi-tone signal (Correction_Factors) or it may represent the
system response to be corrected for flatness and linear phase (Channel_Response).
Apply Corrections
This checkbox activates the application of the correction factors.
For more details about corrections and how the correction factors in a file can be
generated, refer to M8190A Reference Guide.
You can also refer to the Example Programs and Files section which provides an
example to create corrections using the VSA.
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