SELECTIVE AMPLIFIER Russian patent published in 2013 - IPC H03F3/191 

FIELD: radio engineering, communication.

SUBSTANCE: amplifier comprises a current input of a device (1), the first (2) input transistor, the emitter of which via the first (3) current-stabilising dipole is connected with the first (4) bus of the power supply source, and the base is connected to the additional source of voltage (5), a current mirror (6), the first (7) and second (8) correcting capacitors, at the same time the collector of the first (2) input transistor is connected with the input of the current mirror (6), between the common emitter output of which and the common bus of power supply sources there is the first (7) correcting capacitor connected by AC, besides, between the common emitter output of the current mirror (6) and the second (9) bus of the power supply source there are serially connected the first (10) and the second (11) frequency-setting resistors, the common unit of which is connected with the emitter of the first (2) input transistor via the second (8) correcting capacitor and via the third (12) correcting capacitor it is connected with the input of the additional current amplifier (13), and the current input of the device (1) is connected with the emitter of the first (2) input transistor or the input of the current mirror (6).

EFFECT: higher quality of amplifier amplitude-frequency characteristic and its amplification ratio by voltage at quasi-resonance frequency f₀.

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