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

FIELD: radio engineering.

SUBSTANCE: selective amplifier includes input voltage source (1), input transistor (2), the emitter of which is connected through the first (3) current-stabilising bipole to the first (4) power supply bus; base is connected to potential bias circuit (5); collector is connected to emitter of output transistor (6) and through the second (7) current-stabilising bipole to the second (8) power supply bus; base of output transistor (6) is connected to additional voltage source (9), and collector is connected to output of device (10) and through the first resistor (11) to the first (4) power supply bus. The first (12) balancing capacitor is connected between emitter of input transistor (2) and collector of output transistor (6); collector of input transistor (2) is connected to emitter of output transistor (6) through the second (13) resistor and to input voltage source (1) through the second (14) balancing capacitor.

EFFECT: improving Q factor of amplitude-frequency response of the amplifier and its voltage amplification factor at quasi-resonance frequency f₀.

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