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

FIELD: radio engineering.

SUBSTANCE: selective amplifier has a signal source (1), a first (2) input transistor base, a first (3) current stabilising two-terminal device, a first (4) power supply bus, a first (5) load resistor, a second (6) power supply bus, a device (7), a first (8) balancing capacitor, a second (9) input transistor, a second (10) current stabilising two-terminal device, a second (11) balancing capacitor, a first (12) output transistor, a second (13) output transistor, a third (14) output transistor, a third (15) current stabilising two-terminal device, a fourth (16) output transistor, an auxiliary supply voltage source (17), a fourth (18) current stabilising two-terminal device and a frequency setting resistor (19).

EFFECT: high Q-factor of the amplitude-frequency curve of the amplifier and its voltage gain at quasi-resonance frequency f₀.

3 cl, 12 dwg