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 low-pass filter of the Sallen-Key family contains an input (1) and an output (2), a differential operational amplifier (3), the first (4) and second (5) frequency-setting capacitors, as well as the first (6), second (7), third (8) and fourth (9) resistors. The inverting input of the differential operational amplifier (3) is connected to the common power supply bus through the fourth (9) resistor and is connected to the output of the differential operational amplifier (3) through the third (8) resistor. Input (1) is connected to the non-inverting input of the differential operational amplifier (3) through the first (6) and second (7) resistors connected in series, the common node of which is connected to the output 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 the first (10) additional buffer amplifier, the output of which is connected to the output (2) of the device and, through the first (11) and second (12) additional resistors connected in series, to the common power supply bus. The common node of the first (11) and second (12) additional resistors is connected to the input of the second (13) additional buffer amplifier, the output of which is connected to the input of the first (10) additional buffer amplifier through the first (4) frequency setting capacitor.
EFFECT: creation of a low-pass filter of the Sallen-Key family, which provides for the possibility of independent adjustment by different resistors of the pole frequency, the quality factor of the pole and the transmission coefficient.
1 cl, 5 dwg
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