SELECTIVE AMPLIFIER Russian patent published in 2012 - IPC H03F3/00 

FIELD: radio engineering.

SUBSTANCE: first (17) correcting capacitor is connected in series with the second (16) frequency-determining resistor to selective amplifier; the second (18) correcting capacitor is arranged parallel to the first (13) frequency-determining resistor as to alternating current, and output of device (11) is connected to base of the first (1) input transistor through buffer amplifier 19.

EFFECT: improving Q factor of amplitude-frequency response owing to increasing the voltage amplification factor at quasi-resonance frequency f₀.

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