BROADBAND BAND-PASS FILTER WITH INDEPENDENT ADJUSTMENT OF POLE FREQUENCY, POLE ATTENUATION AND TRANSMISSION COEFFICIENT Russian patent published in 2019 - IPC H03H11/12 

FIELD: radio engineering and communication.

SUBSTANCE: invention relates to radio engineering and communication and can be used as an interface for selecting a given spectrum of a signal source. Proposed filter comprises first and second differential operational amplifiers, resistors and capacitors connected to each other such that pole frequency ω_p, at which phase shift is -180°, varies due to second 5 and third 6 resistors (R5 and R6) in relatively wide limits, when resistance of fourth 8 (R8) and sixth 10 (R10) resistors change, PFC inclination in the area of pole frequency changes and AFC rise at this frequency. At that, pole frequency remains invariable (ω_p=const). When adjusting the pole attenuation, the frequencies at which the phase shift is -135° and -225° are varied. When changing transmission coefficient M at central frequency using resistance of first 4 (R4) and fifth 9 (R9) resistors, only the overall AFC level changes, wherein PFC does not change.

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

1 cl, 6 dwg