SELECTIVE AMPLIFIER Russian patent published in 2013 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: selective amplifier comprises a source of input voltage (1), connected with the base of the first (2) input transistor, the emitter of which via the first (3) current-stabilising dipole is connected with the first (4) bus of a power supply source, the second (5) input transistor, the emitter of which is connected with the first (4) bus of the power supply source via the second (6) current-stabilising dipole, and the collector is connected to the second (7) bus of the power supply source, the first (8) frequency-setting resistor, connected between the output of the device (9) and the second (7) bus of the power supply source, the first (10) frequency-setting capacitor, connected between emitters of the first (2) and second (5) input transistors, at the same time the collector of the first (2) input transistor is connected with the output of the device (9) via an additional straight-displaced p-n transition (11) and is connected by AC to the base of the second (5) input transistor, between the output of the device (9) and the emitter of the second (5) input transistor there is a separating capacitor (12) connected, and the output of the device (9) is shunted by AC by the second (13) frequency-setting resistor.

EFFECT: reduced power consumption of an amplifier due to higher quality of an AFC amplifier and its amplification ratio by voltage at frequency of quasi-resonance f₀.

3 cl, 6 dwg