Have Function Generators Evolved?

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Function generators fit into a category of low-frequency or baseband sources. They produce frequencies barely into the RF range and are distinguishable from signal source instruments by the frequency range and variety of signal shapes.

Function generators have come a long way. They evolved from a humble beginning of low-frequency audio oscillator in the late 1930s — only producing sine waves but had great low-harmonic distortion to create high fidelity sound. These oscillators are based on vacuum tube components and continue to improve in harmonic distortion performance till the 1950s. The schematic of the audio oscillator shown in Figure 1 is a Wien bridge oscillator circuit with a patented incandescent light bulb used to control the gain stability.

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Have Function Generators Evolved?

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