ACTIVE PIEZOELECTRIC BANDPASS FILTER Russian patent published in 2019 - IPC H03H15/00 H03H11/02 

FIELD: radio engineering; electronics.

SUBSTANCE: invention relates to radio electronics and can be used for signal selection. Disclosed is an active piezoelectric bandpass filter comprising input and output potential terminals, a common bus, an operational amplifier having two inputs and one output connected to an output potential terminal, first and second two-terminal devices connected by first terminals to potential input terminal, and second ones – to appropriate input of operational amplifier. First and the second two-terminal devices are made in the form of connected in parallel capacitor and two piezoelectric resonators, to the additional potential terminal there is connected an additional two-terminal device, which contains connected in parallel capacitor and inductance coil with tapping from part of turns, the second output of the two-terminal device is connected to the common bus, and an additional rejection two-terminal device made as per the circuit containing a capacitor and an inductive element with variable inductance, which is made according to the scheme of the generalized resistance converter. Such circuit connection allows transforming the resistance value of the circuit with the possibility of selecting the value of the inductance coil.

EFFECT: tuned frequency rejection in bandpass range of bandpass filter.

1 cl, 4 dwg