Frequency-to-voltage conversion is the conversion of frequency parameters into voltage parameters for signal processing or control technology, commonly found in the fields of FM demodulation, motor frequency conversion control, etc. In frequency-to-voltage conversion, that is, there is a linear function between frequency and voltage, and a specific frequency signal corresponds to a specific voltage signal. For a sine wave, if its frequency is constant, then after the F/V change, a constant DC voltage should appear. The magnitude of the output voltage has nothing to do with the amplitude of the sine wave, only its frequency.
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