Signal generator - Wikipedia
https://en.wikipedia.org/wiki/Signal_generator
OverviewGeneral-purpose signal generatorsHistorySpecial purpose signal generatorsSee alsoExternal linksA function generator is a device which produces simple repetitive waveforms. Such devices contain an electronic oscillator, a circuit that is capable of creating a repetitive waveform. (Modern devices may use digital signal processing to synthesize waveforms, followed by a digital-to-analog converter, or DAC, to produce an analog output.) The most common waveform is a sine wave, but sa…
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