FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment and can be used, for example, as spectrum limiters connected at the input of analogue-to-digital converters for various purposes. Active third-order active low-pass RC filter based on an operational amplifier with a paraphrase output comprises a differential operational amplifier (4) with inverting (5) and non-inverting (6) antiphased outputs, resistors, capacitors. Between common node of first (7) and second (8) resistors and non-inverting input of differential operational amplifier (4) there connected in series are third (12) and fourth (13) resistors, common node of which is connected to non-inverting output (6) of differential operational amplifier (4) through third (14) capacitor, wherein inverting input of differential operational amplifier (4) is connected to common bus of power sources (10), its inverting output (5) is connected to first (2) output of device, and its non-inverting output (6) is connected to second (3) output of device.
EFFECT: technical result consists in increase in the guaranteed frequency-domain characteristic attenuation of LPF outside the operating frequencies range and reduction of output resistance of the device.
4 cl, 6 dwg
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