LOW-PASS FILTER BASED ON A MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIER Russian patent published in 2023 - IPC H03H11/12 

FIELD: radio engineering and communications.

SUBSTANCE: invention can be used as a device for extracting a given signal spectrum. In the low-pass filter, the output of the second voltage amplifier is connected to the output of the second voltage follower through the series-connected frequency-setting first resistor and second capacitor, an inverting operational amplifier is used as the first voltage amplifier, the inverting input of which is connected to the output of the first voltage follower through the first frequency-setting capacitor and is connected to a common node of series-connected frequency-setting first resistor and the second capacitor through the second frequency-setting resistor, and a multidifferential operational amplifier is used as the second voltage amplifier, the output of which is connected to the inverting input of its first port, the non-inverting input of the first port is connected to the output of the device through the first additional resistor and connected to the main input of the device through the second additional resistor, and the second port is connected to the additional inputs of the device.

EFFECT: provision in the low-pass filter with independent adjustment of the transmission coefficient, as well as the frequency and quality factor of the low-pass filter pole by different resistors

1 cl, 11 dwg