SECOND-ORDER LOW-PASS FILTER ON SWITCHED CAPACITORS AND SIGNAL ADDER BASED ON MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIER Russian patent published in 2024 - IPC H03H19/00 

FIELD: radio engineering.

SUBSTANCE: disclosed is a second-order low-pass filter on switched capacitors and a signal adder, the circuit of which includes multidifferential operational amplifier (11), the inverting input of the first port of which is connected to the output of multidifferential operational amplifier (11), the non-inverting input of the first port is connected to output (2) of the device, inverting input of second port is connected to common bus of power supplies, and non-inverting input of second port is connected to input (1) of device, output of multidifferential operational amplifier (11) is connected to inverting (4) input of differential operational amplifier (3) through series-connected first (7) and second (8) electronic switches, common node of which is connected to common power supply bus through series-connected frequency-setting resistor (10) and second (9) frequency-setting capacitor.

EFFECT: reducing the number of resistors of the frequency-setting circuit and providing the possibility of single-element frequency adjustment.

1 cl, 7 dwg