UNIVERSAL ACTIVE RC-FILTER OF THE SECOND ORDER ON THE BASIS OF MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIERS Russian patent published in 2019 - IPC H03H11/12 H03H7/12 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering. Second-order active RC filter of the second order based on multi-differential operational amplifiers comprises first (8) and second (9) multi-differential operational amplifiers (MOA), each of which contains inverting and non-inverting inputs of first input port, as well as inverting and non-inverting inputs of second input port, first (10) capacitor connected between second (2) input of device and first (5) output of device, second (11) capacitor connected between fourth (4) input of device and third (7) output of device, first (12) resistor connected between output of first (8) MOA and first (5) output of device, second (13) and third (14) resistors. Circuit incorporates third (15) additional MOA with the first and second input ports, as well as fourth (16) and fifth (17) additional resistors.

EFFECT: independent adjustment of the Q-factor of the AFC pole, at which the transmission coefficient and the AFC pole frequency, which depend on other parameters of the elements, remain constant.

8 cl, 16 dwg, 1 tbl