FIELD: measuring devices. SUBSTANCE: device has comparison unit, harmonic voltage source, time-to-amplitude converter, sign comparator, controlled gate, adder and controlled amplifier. Device converts argument X, which is represented as ratio of voltage of input signal, to time interval, which duration is proportional to 
. Then, time interval is converted to voltage that is proportional to duration of this time interval. Finally, this voltage is converted to result functions ϕ1 and ϕ2. EFFECT: increased functional capabilities. 3 cl, 2 dwg
