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. A band-pass filter of the Sallen-Key family 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. The inverting input of the differential operational amplifier (3) is connected to the 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 output of the differential operational amplifier (3) is connected to the common power supply bus through the second (7) resistor connected in series and the first (4) frequency setting capacitor, the common node of which is connected to the non-inverting input of the differential operational amplifier (3) through the second (5) frequency setting capacitor. The non-inverting input of the differential operational amplifier (3) is connected to the input of an additional buffer amplifier (11), 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, common the node of which is connected to the non-inverting input of the differential operational amplifier (3) through the third (8) resistor. The input (1) of the device is connected to a common node connected in series with the second (7) resistor and the first (4) frequency-setting capacitor 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.
2 cl, 5 dwg
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