ACTIVE RC-FILTER 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 during its further processing by analog-to-digital converters of various modifications. Active RC-filter with independent adjustment of the main parameters includes differential operational amplifiers, resistors and capacitors connected to each other so as to ensure invariable frequency of the pole, as well as to ensure attenuation adjustment with the specified phase shift. At that, when adjusting the transmission ratio by changing first resistor (5), the phase-frequency characteristic does not change substantially, only the overall AFC level changes.

EFFECT: design of a band-pass filter circuit with lower parametric sensitivity with independent adjustment of three main parameters of AFC – frequency of the pole (ωs), pole attenuation (ds), as well as transmission coefficient in pass band (M).

1 cl, 5 dwg