JPS56145363A - Frequency-voltage converter - Google Patents

Abstract

PURPOSE:To facilitate alteration in the case when an input frequency band is changed and to simplify the preparation of circuits by converting an input signal to a pulse signal and by counting digitally the frequency of the pulse signal. CONSTITUTION:The input signal is given to a clock input terminal of FF2 through a comparator 1, while the set output QA and reverse set output QB of FF2 are inputted in AND gates 3A, 3B and NAND gates 4A, 4B. Meanwhile, a clock pulse CP from a clock signal generator 5 is inputted in counters 6A and 6B through the AND gates 3A and 3B and the counted value of the counters 6A and 6B is latched to a latch circuit 8 at the rising timing of a pulse signal B through a selector 7. And, the output of the latch circuit 8 is inputted in a DA converter 9 and converted into voltage corresponding to the frequency. By this constitution, the adjustment of the frequency of the clock pulse alone is required in the case when the input signal frequency band is changed, and thus alteration is facilitated.