DSP Signal Generator Implementation On C6713 DSK - ComLab

1.2 Signal Generator
The signal generator is referred to a wide range of devices used to test electronic equipments by
generating a signal whose frequency, wave shape, and amplitude are independently adjustable
over a wide range of settings [9].
Signal generator come in many different forms. The most prevalent signal generator types
include function generator and arbitrary waveform generator. The signal generator types vary in
their feature and functionality (and at varying level of expense) and are suitable for many
different applications; in general, no single device is suitable for all possible applications [10].
1.2.1 Function Generator
Function generators create built-in waveforms, such as sine, square or triangle waves, at
adjustable frequencies and amplitude. Some function generators can also generate white or pink
noise.
Function generators can be either analog or digital based. Analog based function generators use
electrical circuit which is combination of capacitor, resistor, inductors and other hardware to
create simple functions and often they are used when a static sine or square wave at a specified
frequency is required in a certain application.
Digital based function generators use combination of DSP, DAC and memory buffer to
dynamically create signals. Many signal generators create signals by dividing an internal
timebase by an integer factor. This is called the divide-by-N method. Divide-by-N clocking,
however, gives a limited set of frequencies. Figure 1.5 shows a basic architecture of digital based
function generators.
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