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Generating
Modulated
Waveforms
1
Off
I & Q modulation is one of the fastest growing requirements for
digital waveform generation applications. The 2074 can generate
phase modulation and QAM modulation on all four channels where
each pair generates a separate modulation scheme. Having two
pairs of modulation channels is specifically helpful for speeding up
tests on parts in production.
Modulated waveforms are selected from the waveforms menu.
Figure 3-21 shows how to select the modulation type. To access
this menu, press TOP, then waveforms and select the Modulated
waveforms option.
Modulation type is selected from the Modulation Type menu. Refer
to Figure 3-21 and use the following procedure to select the
modulation type.
1. Press on the Modulation Type soft key. The following options
will display: Off, (n)PSK and (n)QAM
2. Using the dial or the up and down arrow keypad, scroll down to
the desired option
3. Press Enter to lock in the selected modulation type. The output
will be updated immediately after you press the Enter button.
Figure 3-21, Selecting a modulated Waveform
The Modulation Off is a special case of the modulation function
where the output is not modulated but generates carrier waveform
(CW) frequency only. CW is the sine waveform that is being
modulated. When placed in Modulation Off, the sine waveform is
generated from the main outputs continuously. Figure 3-22 shows
the Modulation Off menus.
While in the Off option, there are some parameters that can be
Using the Instrument
Generating Modulated Waveforms
3
2
3
3-45
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