FIELD: radio engineering.
SUBSTANCE: invention relates to the field of radio engineering, as well as measuring technology and can be used, for example, to filter interference in radio monitoring systems in the shortwave range. A fourth-order notch filter is proposed, in contrast to the prototype, an output notch filter (27) is introduced into its circuit, which is identical to the input notch filter in terms of the composition of elements, connections between them and the functional purpose of inputs and outputs, containing the first (28) (in.1*) and the second (29) (in.2*) inputs, as well as the first (30) (out.1*) and second (31) (out.2*) outputs, an additional inverting amplifier (32).
EFFECT: creation of a notch filter of the fourth order with the ability to adjust the stopband.
2 cl, 6 dwg
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