FIELD: physics.
SUBSTANCE: invention relates to means of extracting a predetermined spectrum of a signal source, e.g. during further processing by analogue-to-digital converters of various modifications. Second-order band-pass filter with independent adjustment of main parameters comprises first and second differential operational amplifiers, resistors and capacitors, wherein phase shift is provided by using second and third resistors, when resistance of the first, fifth and eighth resistors changes the PFC inclination in the frequency region of the pole and changes the amplitude-frequency response at that frequency, as well as when changing the transmission coefficient M at the central frequency by changing the resistance of the fourth resistor, only the AFC level changes, wherein the PFC does not change.
EFFECT: technical result consists in providing independent adjustment of three main parameters of AFC – pole frequency (ωp), pole attenuation (dp), as well as transmission coefficient in pass band (M).
1 cl, 5 dwg
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Authors
Dates
2019-08-21—Published
2019-02-25—Filed