SELECTIVE AMPLIFIER Russian patent published in 2014 - IPC H03F3/45 H03H11/00 H03K5/00 

FIELD: radio engineering, communication.

SUBSTANCE: selective amplifier has an input signal source, a voltage-to-current converter, an input transistor, an auxiliary voltage source, first and second frequency-setting resistors, first and second balancing capacitors, an additional current mirror and two current-stabilising two-terminal elements. The input signal source is connected to the input of the voltage-to-current converter. The base of the input transistor is connected to the auxiliary voltage source. The output of the voltage-to-current converter is connected to the collector of the input transistor and through the first frequency-setting resistor to the first power supply bus, and is also connected to the input of the additional current mirror. The common emitter output of the additional current mirror is connected to the second power supply bus through the first additional current-stabilising two-terminal element.

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

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