FIELD: radio equipment.
SUBSTANCE: invention relates to radio engineering and can be used as spectrum limiters connected at the input of analogue-to-digital converters for various purposes. Active RC-filter of low frequencies contains two multi-differential operational amplifiers MOA (7) and (6), operational amplifier (5) with inverting and non-inverting inputs and inverting and non-inverting outputs, capacitors and resistors. Between inverting and non-inverting inputs of MOA (6) there is frequency-setting resistor (18), inverting output of MOA (6) is connected to non-inverting input (19) of MOA (6) and through first (14) frequency-setting resistor is connected to non-inverting input of first (5) operational amplifier, non-inverting output MOA (6) is connected to inverting input (22) MOA (6) and through second (15) frequency-setting resistor is connected to inverting input of first (5) of the operational amplifier.
EFFECT: technical result is to provide adjustment of the LPF amplitude-frequency characteristic without changing the coefficient at zero frequency.
1 cl, 4 dwg
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