FIELD: radio engineering.
SUBSTANCE: invention relates to radio engineering and communications and can be used as a device for extracting a given signal spectrum, for example, during its further processing by analog-to-digital converters of various modifications. The Sallen-Key class band-pass filter with independent adjustment of the main parameters contains an input (1) and an output (2) of the device, a differential operational amplifier (3), the first (4) and second (5) frequency-setting capacitors, as well as the first (6), second (7) and third (8), fourth (9) and fifth (10) resistors, moreover, the inverting input of the differential operational amplifier (3) is connected to a common power supply bus through the fifth (10) resistor and connected to the output of the differential operational amplifier (3 ) through the fourth (9) resistor. The non-inverting input of the differential operational amplifier (3) is connected to the input of the first (11) additional buffer amplifier, the output of which is connected to the output (2) of the device and connected to a common power supply bus through the first (12) and second (13) additional resistors connected in series, the common node of the first (12) and second (13) additional resistors is connected to the input of the second (14) additional buffer amplifier, the output of which is connected to the non-inverting input of the differential operational amplifier (3) through the first (4) frequency setting capacitor, wherein the output of the differential operational amplifier (3) is connected to a common power supply bus through the second (5) frequency-setting capacitor and the third (8) resistor connected in series, the common node of which is connected to the input of the first (11) additional buffer amplifier through the second (7) resistor, and the input (1) of the device is connected to the inverting input of the differential operational amplifier (3) through the first (6) resistor.
EFFECT: creation of a band-pass filter of the Sallen-Key family, which provides for the possibility of independent adjustment of the pole frequency and the quality factor of the pole by different resistors.
1 cl, 5 dwg
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