FIELD: physics.
SUBSTANCE: invention relates to means used as an interface for selecting a predetermined spectrum of a signal source, for example, during its 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, common node of which is connected to inverting input of second (4) differential operational amplifier. Output of second (4) differential operational amplifier is connected to inverting input of first (3) differential operational amplifier through in-series connected first (14) capacitor and fourth (9) resistor, output of first (3) differential operational amplifier is connected to non-inverting input of first (3) differential operational amplifier through series-connected sixth (11) and seventh (12) resistors, common node of which is connected to common unit of in-series connected first (14) capacitor and fourth (9) resistor through fifth (10) resistor, output (2) of the device is connected to inverting input of first (3) differential operational amplifier through second (15) capacitor and is connected to inverting input of second (4) differential operational amplifier through third (8) resistor.
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
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