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

FIELD: radio engineering, communications.

SUBSTANCE: selective amplifier comprises a current input (1), connected with the input of the first (2) current mirror, matched with the first (3) bus of a power supply source, the second (4) current mirror matched with the second (5) bus of a power supply source, the input of which is connected to the output of the first (2) current mirror. Besides, between the output of the second (4) current mirror and the first (3) bus of the power supply source there is the first (6) resistor connected. The output of the second (4) current mirror is connected by AC to the common bus of power supply sources via serially connected first (7) and second (8) correcting capacitors, the common unit of the first (7) and second (8) correcting capacitors via the second (9) resistor is connected to the input (10) of the first (11) current amplifier, the output (12) of which is connected to the input of the first (2) current mirror, besides, the common unit of the first (7) and second (8) correcting capacitors via the third (13) resistor is connected with the input (14) of the second (15) current amplifier.

EFFECT: higher quality of amplifier amplitude-frequency characteristic and its amplification ratio by voltage at quasiresonance frequency.

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