FIELD: engineering and communications.
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 subclass with independent adjustment of the main parameters contains an input (1) and an output (2) of the device, the first (3) and second (4) frequency-setting capacitors, the first (5) and second (6) frequency-setting resistors, an output follower voltage (7), the output of which is connected to the output (2) of the device. The first (8), second (9) and third (10) additional voltage followers are introduced into the circuit, the output (2) of the device is connected to the common power supply bus through the first (11) and second (12) additional resistors connected in series, the common node of which is connected to the input of the first (8) additional voltage follower, the output of the first (8) additional voltage follower is connected to the input of the output voltage follower (7) through the second (4) frequency-setting capacitor, the output (2) of the device is connected to a common power supply bus through the third (13) and fourth (14) additional resistors connected in series, the common node of the third (13) and fourth (14) additional resistors is connected to the input of the second (9) additional voltage follower, the output of the second (9) additional voltage follower is connected to the input of the third (10) additional voltage follower through the first (3) frequency-setting capacitor, and the input (1) of the device is connected to the third (10) additional voltage follower through the first (5) frequency-setting resistor, and the output of the third (10) additional voltage follower is connected to the input output voltage follower (7) through the second (6) frequency setting resistor.
EFFECT: creation of a low-pass filter of the Sallen-Key family, which provides for the possibility of independent adjustment of the pole frequency, the quality factor of the pole and the transmission coefficient by different resistors.
1 cl, 6 dwg
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