Abstract
An important area of metrology is measuring time and frequency. In the equipment of radio measuring devices for measuring time and frequency parameters of radio signals and/or electrical circuits, the main functional element is electric filters. The efficiency of functioning of devices for measuring time and frequency parameters of radio signals depends on the quality of electric filters, stability of their parameters and characteristics. At the same time, there are requirements for frequency distortion and inertial properties of other stages of processing the measuring signals and elements and circuits of interstage connections. Therefore, the efficiency of frequency selection of measuring signals of primary sensors significantly depends on the quality of electric filters. The principle of the electric filter operation is based on functional dependence of inductive and capacitive elements on frequency, as well as on the phase ratios of voltage and current on them. Nowadays, not only positive but also negative differential capacitance is used in the synthesis and design of electronic circuits. The concept of negative differential capacitance is especially useful in practical implementation of active filters, noise compensators, capacitive sensors, capacitive transducers, etc. The aim of the paper is to increase the frequency overlap ratio for the active filters in the sensors of physical quantities using active elements with a negative value of the differential capacitance.
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