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

FIELD: radio engineering, communications.

SUBSTANCE: between a collector of the third (6) input transistor and the common bus (7) of supply sources there are the first (14) and the second (15) correcting capacitors connected by AC in series, besides, the common unit of the first (14) and second (15) correcting capacitors is connected to an input of an output buffer amplifier (16) and via an additional resistor (17) it is connected to an emitter of the third (6) input transistor.

EFFECT: higher quality of selective amplifier resonant amplitude-frequency characteristic and its amplification ratio by voltage at quasiresonance frequency f₀, reduced total power consumption of crystal-based systems and realisation of a high-quality selective device.

2 cl, 10 dwg