FREQUENCY-SELECTIVE SYSTEM Russian patent published in 2011 - IPC H03H7/12 H03H9/54 

FIELD: radio engineering.

SUBSTANCE: device includes common bus, potential input terminal connected to the first output of inductance coil (IC) (2) the second output of which is connected to the first output of capacitor (C) (3) and the first outputs of two input piezoelectric resonators (PR) (4,5) the second outputs of which are connected to inputs of differential amplifier (DA) (7), and the second output of C (3) is connected to common bus. System includes M links; each link includes two output PR (12-19) and one operating amplifier (OA) (8-11). The first output of PR (12-19) is connected in each link to each input of OA, the second outputs of PR are combined in pairs and connected to each other, the second output of PR of odd-numbered links are connected to the first output of DA (7), and the second outputs of PR of even-numbered links are connected to the second output of DA (7). Output of each OA (8-11) is connected to the first output of the first C (20-24), the second output of which is connected to the first output of the second C (21, 25, 29, 33) and to the first output of IC (22, 26, 30, 34), the second output of the second C (21, 25, 29, 33) is connected to common bus, and the second output of IC (22, 26, 30, 34) is connected to separate potential output terminal of the device.

EFFECT: reduction of non-uniformity of amplitude-frequency characteristic in band-pass filters adjacent as to frequency band.

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