FIELD: radio electronics.
SUBSTANCE: invention relates to radio electronics and can be used for signal selection. System comprises input and output potential terminals, common bus, operational amplifier, having two inputs and one output, connected to output potential terminal, the first and the second two-terminal devices, connected by the first leads to the potential input terminal, and the second - to the corresponding input of the operational amplifier, in which the output is connected to the output potential terminal. First two-terminal device is in form of series-connected inductance coil and two-terminal device comprising two parallel connected piezoelectric resonators and capacitor, the second two-terminal device is made in the form of parallel connected inductance coil, capacitor and two piezoelectric resonators.
EFFECT: technical result consists in expansion of arsenal of active piezoelectric resonant frequency-selective system, which plays the role of phase-rotation link.
1 cl, 3 dwg
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