SECOND-ORDER ACTIVE BAND-PASS FILTER WITH INDEPENDENT ADJUSTMENT OF MAIN PARAMETERS

摘要

FIELD: physics.;SUBSTANCE: invention relates to means 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 comprises first (3) and second (4) differential operational amplifiers, first (5) and second (6) series-connected resistors connected between device input (1) and output of second (4) differential operational amplifier. Inverting input of second (4) differential operational amplifier is connected to device output (2) through third (8) resistor, output (2) of device is connected to common bus of power sources (7) through serially connected fourth (9) and fifth (10) resistors, output of second (4) differential operational amplifier is connected to inverting input of first (3) differential operational amplifier through series-connected first (13) capacitor and seventh (12) resistor, common node of which is connected to common unit of fourth (9) and fifth (10) serially connected resistors through sixth (11) resistor, inverting input of first (3) differential operational amplifier is connected to device output (2) through second (14) capacitor, and non-inverting input of first (3) differential operational amplifier is connected to common bus of power supply sources (7).;EFFECT: technical result consists in providing band-pass filter circuit with lower parametric sensitivity with independent adjustment of three main parameters of AFC – frequency of pole (ωs), pole attenuation (ds), as well as transmission coefficient in pass band (M).;1 cl, 5 dwg