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Digital Waveform Generation by Pete Symons

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5 DDS arbitrary waveform generation

5.1 From sinusoidal to arbitrary waveforms

In Chapter 4 we investigated sinusoidal DDS and developed the concept of phase–amplitude mapping using a wavetable. In sinusoidal DDS, the wavetable is a lookup table that tabulates one cycle of a sine function and translates from the phase domain to the amplitude domain. In this chapter we extend this idea to the generation of non-sinusoidal waveforms where a single-cycle, periodic arbitrary waveform function is now tabulated in the wavetable. We call this method DDS arbitrary waveform generation or DDS AWG. DDS AWG is a generalisation of sinusoidal DDS that generates arbitrary waveforms with fixed waveshape and independently controlled frequency, phase offset and amplitude. ...

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