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

FIELD: radio engineering, communication.

SUBSTANCE: controlled selective amplifier comprises an input signal source, two input transistors, two current-stabilising two-terminal elements, a power supply, a current mirror, two balancing capacitors, a resistor and a buffer amplifier. The input transistors used are field-effect transistors, whose sources correspond to the emitter, the drain to the collector and the gate to the base of a bipolar transistor.

EFFECT: lower overall power consumption owing to higher attenuation of the input signal in the low frequency range with high stability of the Q factor of the amplitude-frequency characteristic of the selective amplifier and voltage gain at quasi-resonance frequency f₀.

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