Editing Signal generator (section)

=== Function generator ===
[[File:Leader LSG-15 signal generator.jpg|thumb|350px|[[Leader Instruments]] LSG-15 signal generator]]
{{main|Function generator}}

A [[function generator]] is a device which produces simple repetitive [[waveform]]s. Such devices contain an [[electronic oscillator]], a [[Electronic circuit|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 [[sawtooth wave|sawtooth]], step ([[pulse (signal processing)|pulse]]), [[Square wave (waveform)|square]], and [[triangle wave|triangular]] waveform oscillators are commonly available as are [[arbitrary waveform generator]]s (AWGs). If the oscillator operates above the human hearing range (>20&nbsp;[[kHz]]), the generator will often include some sort of [[modulation]] function such as [[amplitude modulation]] (AM), [[frequency modulation]] (FM), or [[phase modulation]] (PM) as well as a second oscillator that provides an [[audio frequency]] modulation waveform.