Voltage-to-frequency converter circuit

摘要

A voltage-to-frequency converter circuit comprising an input circuit which receives an input signal and converts it to a pair of D.C. voltage signals of equal absolute values and opposite polarities; a standard analog integrator cirucit which receives at its one input part the positive and negative D.C. voltage signals, alternately through an inverting switching circuit, so as to integrate them to a predetermined upper limit threshold value and lower limit threshold value; an output circuit which produces a rectangular wave signal that is inverted each time the output signal of the integrator reaches either of the upper limit threshold value or the lower limit threshold value; and a feed-forward circuit which creates voltage divider circuit between the D.C. voltage signal from the inverting switching circuit and the D.C. voltage signal of the output circuit. The voltage divider alters the value of the upper and lower limit threshold voltages, thereby maintaining a linear relation between the output frequency of the output circuit and the D.C. input voltage.