SELECTIVE AMPLIFIER WITH EXTENDED FREQUENCY BAND Russian patent published in 2014 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: selective amplifier includes a main operational amplifier, between the output and the inverting input of which a first frequency-setting resistor is connected, first and second frequency-setting capacitors connected in series between the output of the main operational amplifier and its inverting input, a second frequency-setting resistor, the first lead of which is connected to the common node of the series-connected first and second frequency-setting capacitors, an input voltage source connected to the second lead of the second frequency-setting resistor. The input voltage source is connected to the second lead of the second frequency-setting resistor through an additional inverting stage, the non-inverting input of which is connected to the inverting input of the main operational amplifier.

EFFECT: wider frequency band of the selective amplifier.

10 dwg