ACTIVE LOW-PASS FILTER OF FOURTH ORDER WITH ZERO OF TRANSFER Russian patent published in 2008 - IPC H03H11/12 

FIELD: radio engineering.

SUBSTANCE: in device due to serial connection of RC-bridge of fourth order (R1, R2, R3, R4 and C1, C2, C3, C4), the first (K1), the second (K2) amplifiers and organization of connections: from the output of the first amplifier (K1) to the second outputs of the first (C1), the third (C3), and through the fifth resistor (R5) of the second (C2) and fourth (C4) capacitors of RC-bridge; from the output of the second amplifier (K2), which is the output of filter, through the fifth capacitor (C5) in the point of connection of the second (C2), fourth capacitors (C4) and fifth resistor (R5); through the sixth capacitor (C6) in the common point of the second (R2), third (R3) resistors and second capacitor (C2) of the bridge, and through the sixth resistor (R6) in the common point of the first (R1), second (R2) resistors and the first capacitor (C1) of bridge, filter attenuation characteristic slope steepness is increased as a result of transfer zero generation behind frequency of filter cut.

EFFECT: increase of fourth order filter attenuation characteristic slope steepness.

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