GRAPHIC EQUALIZER BASED ON MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIERS Russian patent published in 2020 - IPC H03H11/00 H03G5/00 

FIELD: radio equipment.

SUBSTANCE: disclosed is a graphic equalizer based on multi-differential operational amplifiers (OA), in which the output of the first OA is connected to its inverting input of the first port and the output of the device, and also connected to input of voltage repeater through second resistor, third frequency-setting resistor is connected between input of voltage follower and common bus of power sources, output of voltage follower is connected to non-inverting input of second port of second OA, output of third OA is connected to its non-inverting input of first port through fourth frequency-setting resistor, non-inverting input of second port of third OA is connected to common bus of power sources, non-inverting input of second port of first OA is connected to inverting input of second port of third OA, device output is connected to the non-inverting input of the first OA port and is connected to the non-inverting input of the second port of the second OA and the non-inverting input of the first port of the third OA through the second capacitor.

EFFECT: design of a graphic equalizer circuit, having the possibility of adjusting amplitude-frequency and phase-frequency characteristics.

1 cl, 4 dwg