ACTIVE RC-FILTER OF LOWER FREQUENCIES OF THIRD ORDER WITH DIFFERENTIAL INPUT BASED ON OPERATIONAL AMPLIFIER WITH PARAPHRASE OUTPUT

摘要

FIELD: radio equipment.;SUBSTANCE: active RC-filter comprises a differential operational amplifier with non-inverting and inverting paraphrase outputs, a first capacitor connected between the inverting input of the differential operational amplifier and its non-inverting output, a second capacitor connected between the non-inverting input of the differential operational amplifier and its inverting output, circuit also includes a fifth capacitor which is connected between common unit of in-series connected fifth and sixth resistors and first output of device, wherein fourth capacitor is connected between common unit of in-series connected second and third resistors and second output of device, seventh resistor is connected between common unit of series-connected first and second resistors and first output of device, eighth resistor is connected between common unit of series-connected fourth and fifth resistors and second output of device.;EFFECT: technical result consists in simplification of procedure for adjustment of main LPF parameters, as well as in increase of guaranteed attenuation of amplitude-frequency characteristic beyond the limits of operating frequency band at low values of its output resistances.;1 cl, 3 dwg