A Broadband Frequency-to-Voltage Converter for Sinusoidal Signals Based on Filters Design

The frequency-to-voltage converter is a versatile circuit that translates variations in frequency to a corresponding voltage level. However, converting high-frequency signals into a DC output voltage has been a challenging task. This paper proposes a new, yet simple, approach for converting the frequency into a DC output voltage of sinusoidal signals. The frequency-to-voltage conversion is achieved by utilizing the attenuation band of a filter. The paper provides a clear mathematical model and a relation between frequency and DC output voltage levels, with merely passive components for efficient power consumption. This technique is implemented to achieve wide frequency spectrum conversion that could extend to tens of MHz and beyond. The proposed scheme is verified experimentally in both low-frequency range, varying in sub-kilohertz, and as high as 40MHz.