SELECTIVE AMPLIFIER WITH HIGH FADE-OUT IN SUBRESONANCE FREQUENCY RANGE Russian patent published in 2015 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: selective amplifier with high fade-out in the subresonance range includes an input differential stage with first and second anti-phase current outputs, a signal source connected to the first input of the input differential stage which is inverting relative to the first current output, a first power supply bus connected to the common source circuit of the input differential stage, the second input of the input differential stage which is non-inverting relative to the first current output, connected to the output of the device, a current mirror which is matched with a second power supply bus, the input of which is connected to the second current output of the input differential stage, and the output is connected to the first lead of a first frequency-setting resistor, a first frequency-setting capacitor, a second frequency-setting resistor and a second frequency-setting capacitor, wherein the output of the current mirror is connected to the first current output of the input differential stage, and the second lead of the first frequency-setting resistor is connected to a static level bias circuit.

EFFECT: wider allowable quasi-resonance frequency range f₀, which depends on numerical values of the resistance of the first frequency-setting resistor.

3 cl, 11 dwg