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

FIELD: radio engineering, communications.

SUBSTANCE: selective amplifier comprises an input (1), the first (2) correcting capacitor, the first (3) input transistor, the first (4) current-stabilising dipole, the first (5) bus of a power supply source, the second (6) input transistor, a source of auxiliary voltage (7), the first (8) resistor, the second (9) bus of a power supply source, the second (10), third (11) and fourth (12) resistors, the second (13) correcting capacitor, an output transistor (14), the second (15) current-stabilising dipole, an output of the device (17), an additional correcting capacitor (18), the third (19) current-stabilising dipole.

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

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