SELECTIVE AMPLIFIER Russian patent published in 2013 - IPC H03F3/00 

FIELD: radio engineering, communication.

SUBSTANCE: amplifier comprises an input transistor (1), the emitter of which via the first (2) current-stabilising dipole is connected with the first (3) bus of the power supply source, the base is connected to the first (4) source of auxiliary voltage, and the collector is connected with the input of a current mirror (5), having a common emitter output (6), matched with the second (7) bus of the power supply source, the first (8) frequency-setting resistor, connected by AC in parallel to the first (9) correcting capacitor. The common emitter output (6) of the current mirror (5) is connected to the second (7) bus of the power supply source via the first (8) frequency-setting resistor and is connected to the emitter of the input transistor (1) via serially connected the second (10) frequency-setting resistor and the second (11) correcting capacitor, the common unit of the second (10) frequency-setting resistor and the second (11) correcting capacitor is connected with the input (12) of the additional current amplifier (13) via the third (14) correcting capacitor, besides, the current input (15) of the device is connected with the emitter (or the collector) of the input transistor (1), and the inverting current output of the current mirror (5) is connected to the second (16) source of auxiliary voltage.

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

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