LOW-PASS FILTER OF THIRD ORDER WITH MINIMUM NUMBER OF CAPACITORS PER ORDER Russian patent published in 2020 - IPC H03H11/12 

FIELD: radio equipment.

SUBSTANCE: invention is a third-order low-pass filter with a minimum number of capacitors an order of magnitude, comprising from first to eighth resistors, from first to fourth capacitors, differential operational amplifier. Between common node first and second series-connected resistors and non-inverting input of differential operational amplifier includes a fifth resistor, between common node of third and fourth serially connected resistors and inverting input of differential operational amplifier includes sixth resistor, between the first output of the device and the inverting output of the differential operational amplifier, a seventh resistor is connected, between the second output of the device and the non-inverting output of the differential operational amplifier there is an eighth resistor, wherein between the first and second outputs of the device a fourth capacitor is connected.

EFFECT: fewer capacitors in the LPF circuit and high guaranteed attenuation of the amplitude-frequency characteristic.

1 cl, 3 dwg