ACTIVE RC LOW-PASS FILTER OF THE SALLEN-KI SUBCLASS BASED ON VOLTAGE REPEATERS Russian patent published in 2022 - IPC H03H11/12 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used as an anti-aliasing filter to limit a given signal spectrum. An active RC low-pass filter of the Sallen-Key subclass based on voltage repeaters contains the first and second frequency-setting capacitors, the first and second frequency-setting resistors, and an output voltage repeater. An additional capacitor, the first, second and third additional voltage repeaters are introduced into the circuit, the output of the device is connected to the common bus of the power supply through the first and second additional resistors, the common node of which is connected to the first additional voltage repeater, the output of the device is connected to the common bus of the power supply through the third and fourth additional resistors, the common node of which is connected to the second additional voltage repeater, the output of which is connected to the third additional voltage repeater.

EFFECT: invention enables to create a low-pass filter of the Sallen-Key family on voltage repeaters (or buffer amplifiers with a voltage transmission coefficient close to one), which provides for the possibility of independent adjustment by different resistors of the pole frequency, pole quality factor and transmission coefficient.

1 cl, 5 dwg