SELECTIVE AMPLIFIER Russian patent published in 2014 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: selective amplifier comprises a first (1) input transistor, the base of which is connected to the input (2) of the device, and the collector is connected to the output (3) of the device and is connected through a first (4) frequency-setting resistor to a first (5) power supply bus, a first (6) balancing capacitor connected via alternating current in parallel to the first (4) ) frequency-setting resistor, a second (7) input transistor, the collector of which is connected to a second (8) power supply bus, and the emitter is connected to the emitter of the first (1) input transistor, a second (9) frequency-setting resistor, the first lead of which is connected to the base of the second (7) input transistor, a second (10) balancing capacitor, the first lead of which is connected to the base of the second (7) input transistor. The second lead of the second (10) balancing capacitor is connected to the output (3) of the device, and the second lead of the second (9) frequency-setting resistor is connected to a first (11) auxiliary voltage source.

EFFECT: reduced overall power consumption.

7 cl, 11 dwg