Because the Fs is eight times the frequency of the sine wave, an engineer or, more likely, a computer needs to extract from a real sine wave eight amplitude values from t = 0 to t = 2π. Let's say we have a DDS signal generator with an 8-bit DAC and it outputs a sinusoidal signal at 100Hz with a sampling frequency of 800Hz. It also has read only memory (ROM) where it stores amplitude values for specific waveforms at various time intervals based on a sampling frequency (Fs). You can use it to test the inner workings of audio amplifiers, find the characteristic of op-amps and diodes, make funky noises-the list of applications goes on.Ī DDS function generator is a digital arbitrary waveform generator, meaning it uses a digital-to-analog converter (DAC) to build a signal. For example, one could generate a sinusoidal signal at 60Hz.
#Signal generator how to#
Therefore, in this article, I am going to explain how to build your own function generator.įirst, a function generator (also called a tone generator) is an electronic device that can output a specific waveform at a set frequency. Building your own devices is not only easier on your wallet, but it is also a great way to improve your knowledge. Having your own electronics laboratory at home is great-the only downside is that even basic equipment can be costly. High-Speed Waveform Generation with an MCU and a DAC How to Generate a High-Precision Waveform Using a DAC and a Custom PCB
PCB Layout for an Arbitrary Waveform Generator Microcontroller Design for an Arbitrary Waveform GeneratorĭAC Schematic Design for an Arbitrary Waveform GeneratorĭAC Output Circuitry for an Arbitrary Waveform Generator Learn how to make your own arbitrary waveform generator using an ATmega328p, a DDS function generator IC, an op-amp, a few passives, and some hard work.
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