CONTROLLED SELECTIVE AMPLIFIER Russian patent published in 2015 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: invention pertains to radio engineering and communication, and, as such, can be used in radio signal filtering devices, television, radio detecting and ranging etc. The controlled selective amplifier contains an input voltage source (1), output transistor (2), auxiliary voltage source (3), the first (4) and the second (5) frequency setting resistors, the first power source bus (6), the first balancing capacitor (7), the second balancing capacitor (8), static mode enabling circuit (9) of the output transistor (2), the second power source bus (10), the first (12), the second (13) and the third (15) supplementary transistors, the first (14) and the second (16) current stabilising impedors. The device output (11) is connected to the common node of the first (4) and the second (5) frequency setting resistors, connected in series.

EFFECT: lower total power consumption owing to a high Q-factor of the amplitude-frequency curve of the amplifier and its voltage gain (K₀) at the quasi-resonance frequency f₀.

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