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

FIELD: radio engineering, communication.

SUBSTANCE: selective amplifier is proposed, which comprises the first input transistor, the emitter of which via the first current-stabilising dipole is connected with the first bus of a power supply source, the base is connected to the first source of additional voltage, and the collector is connected with the emitter of the matching transistor, the second source of additional voltage, connected with the base of the matching transistor, an output transistor, the collector of which is connected to the second bus of the power supply source, the emitter is connected with a potential output of the device, and the base is connected with the collector of the matching transistor and via the first auxiliary resistor it is connected with the second bus of the power supply source, the second current-stabilising dipole, the first output of which is connected with the emitter of the output transistor, and the second output is connected to the first bus of the power supply source. Between the collector of the first input transistor and the common bus of power supply sources there is the first correcting capacitor connected by AC, and between the first output of the second source of reference current and the emitter of the first input transistor there is the second correcting capacitor connected, besides, the common unit of the second correcting capacitor and the first output of the second source of reference current is connected with the current input of the device.

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

2 cl, 8 dwg