UNIVERSAL ACTIVE RC-FILTER OF SECOND ORDER ON MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIERS Russian patent published in 2020 - IPC H03H11/12 

FIELD: radio equipment.

SUBSTANCE: disclosed is a universal active RC-filter, in which input (1) is connected to the first port of third (8) multi-differential operational amplifier (OA) non-inverting input, input (2) is connected to non-inverting input of second port of third (8) OA through fifth (16) resistor, inverting input of second port of third (8) OA and non-inverting input of first port of first (6) OA are combined and connected to second (4) output, output of first (6) OA is connected to second (4) output through first (11) resistor, second (4) output is connected by common bus through first (9) capacitor, inverting input of second port of first (6) OA is connected to third (5) output, output of third (8) OA is connected to its inverting input of first port and connected to first (3) output, third (5) output is connected by common bus through second (10) capacitor, non-inverting input of second port of first (6) OA and non-inverting input of second port of second (7) OA are connected to common bus.

EFFECT: design of a universal filter circuit, which enables to implement a high-pass filter, a band-pass filter and a low-pass filter at its outputs.

1 cl, 5 dwg