LOW-SENSITIVITY BANDPASS FILTER WITH INDEPENDENT ADJUSTMENT OF MAIN PARAMETERS Russian patent published in 2019 - IPC H03H11/12 

FIELD: radio engineering and communication.

SUBSTANCE: invention relates to means of radio engineering and communication and can be used as an interface for selecting a given spectrum of a signal source, for example, during further processing by analog-to-digital converters of various modifications. Filter includes the first and second differential amplifiers, capacitors and resistors interconnected so that when the resistances of the fourth and the sixth resistors change, the PFC inclination changes in the frequency region of the pole and the amplitude-frequency characteristic is increased at that frequency. At that, the pole frequency remains unchanged. When attenuating the pole, the frequencies at which the phase shift is -135 and -225 degrees are varied. When changing the transmission coefficient M at the central frequency using the resistances of the first and fifth resistors, only the overall amplitude-frequency response level changes, wherein the phase-frequency characteristic does not change.

EFFECT: technical result consists in providing independent adjustment of three main parameters of AFC – pole frequency (ω_p), pole attenuation (d_p), as well as transmission coefficient in pass band (M).

1 cl, 5 dwg