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

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering, and specifically to controlled selective amplifiers. The selective amplifier comprises a signal source connected to the base of a first input transistor, a second input transistor, a first current-stabilising two-terminal element connected between the emitter of the first input transistor and a first power supply bus, a second current-stabilising two-terminal element connected between the emitter of the second input transistor and the first power supply bus, a first balancing capacitor connected between the emitter of the first and second input transistors, a first frequency-setting resistor connected between the collector of the first input transistor and a second power supply bus, a second balancing capacitor and a second frequency-setting resistor. The second balancing capacitor is connected between the base of the second input transistor and the collector of the first input transistor; the second frequency-setting resistor is connected between the base of the second input transistor, which is connected to the output of the device and a common power supply bus, wherein the frequency-setting resistor is connected in parallel via alternating current to an additional balancing capacitor.

EFFECT: high Q-factor of the amplitude-frequency characteristic and voltage gain at quasi-resonance frequency.

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