FIELD: physics, radio.
SUBSTANCE: invention relates to radio engineering and can be used in channel forming equipment for designing filter equipment with good characteristics: selectivity, dynamic and frequency bands. The invention involves connecting a first amplifier between a fourth order CR bridge and the input of a second amplifier, as well as setting up feedback: the output of the first amplifier is connected through the sixth resistor and the output of the second amplifier is connected through the sixth capacitor to the common point of the first and second capacitors and the first bridge resistor; the output of the first amplifier is connected through the fifth capacitor to the second terminal of the fourth bridge resistor; the connection point of the fifth capacitor and the fourth resistor is connected through the fifth resistor to the output of the filter which is connected to second leads of the first, second and third bridge resistors.
EFFECT: reduced sensitivity of the transfer function to divergence of amplifier parametres, which leads to increase in dynamic and frequency bands of the filter.
4 dwg
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