FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment and can be used, for example, as spectrum limiters connected at input of analogue-to-digital converters of various purpose. Active RC-filter of lower frequencies of the third order contains input (3) and output (4) amplifiers, first (5), second (6), third (7) and fourth (8) resistors, first (9), second (10) and third (11) capacitors. Input amplifier (3) used is differential operational amplifier, inverting input of which is input of input (3) amplifier, non-inverting input is connected to common power supply bus (12), first (9) capacitor is connected between common unit of second (6) and third (7) series-connected resistors and device output (2), second (10) capacitor is connected between input and output of input (3) amplifier, third (11) capacitor is connected between common unit of first (5) and second (6) series-connected resistors and common bus of power sources (12), wherein fourth (8) resistor is connected between common node of first (5) and second (6) series-connected resistors and output of input (3) amplifier, and output (4) amplifier is used inverting amplifier.
EFFECT: technical result consists in increase of guaranteed attenuation of amplitude-frequency characteristic of active RC-filter.
1 cl, 4 dwg
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