BAND-PASS FILTER ON TWO OPERATIONAL AMPLIFIERS WITH INDEPENDENT ADJUSTMENT OF MAIN PARAMETERS Russian patent published in 2020 - IPC H03H11/12 

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering and can be used as an interface for selecting a given spectrum of a signal source with analog-to-digital converters of various modifications. Band-pass filter is made on two differential operational amplifiers, resistors and capacitors, connected to each other so that when adjusting transmission ratio by changing first resistor PFC is not changed, and only the overall AFC level changes, when the resistances of the second and third resistors change, the PFC slope in the region of the pole changes, as well as the AFC lift at that frequency. At that, pole frequency remains invariable, at adjustment of pole attenuation there change frequencies at which phase shift makes 45° and -45°.

EFFECT: technical result consists in ensuring low parametric sensitivity with independent adjustment of three main parameters of AFC – frequency of pole (ωs), attenuation of pole (ds), as well as transmission coefficient in band pass (M).

1 cl, 5 dwg