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76 U2761A User’s Guide
2 Features and Functions
Amplitude-Shift Keying (ASK) Modulation
ASK is a form of digital modulation in which the modulating
signal apply variations in the amplitude of a carrier signal.
The amplitude of the carrier signal varies simultaneously
with the modulating signal while phase and frequency
remain constant. In other words, the carrier signal can be
assumed as an on and off switch. You can configure the
U2761A to “shift” its output amplitude between two preset
amplitudes using ASK. The rate at which the output shifts
between the two amplitudes is determined by the internal
rate generator. An example of the ASK modulation waveform
is shown in the following.
Figure 2-25 ASK modulation waveform
To Select ASK Modulation
The U2761A allows only one modulation mode to be enabled
at a time. The U2761A does not allow ASK to be enabled at
the same time that sweep is enabled.
ASK rate