voltage frequency converter (VFC)
A voltage-to- frequency converter (V/f), Voltage Frequency Converter (VFC), is an electronic circuit used to convert a voltage into a frequency. In such a circuit, there is a direct, partially linear relationship between the voltage level (U) at the circuit input and the frequency (f) at the circuit output: V/f.
Voltage-to-frequency converters can be implemented by A/D converters that use the voltage-to-frequency method, by multivibrators, or by a voltage-controlled oscillator( VCO), but they differ in circuit construction.
Voltage-to-frequency converters consist of three circuit blocks: inverter, integrator and Schmitt trigger. They are functionally comparable to inverters and are also used in them.