FIELD: physics.
SUBSTANCE: invention relates to means of spectrum limiters connected at the input of analogue-to-digital converters for various purposes. Compared to the prototype in the low-pass active RC filter with single element frequency tuning of the pole on the differential and multi-differential operational amplifiers, the inverting output of the multi-differential operational amplifier (7) is connected to non-inverting input of second (6) differential operational amplifier through series-connected fifth (20) auxiliary and third (18) frequency-setting resistors, non-inverting output of multi-differential operational amplifier (7) is connected to inverting input of second (6) differential operational amplifier through series-connected sixth auxiliary (21) and fourth (19) frequency-setting resistors, main inverting input (11) of second port of multi-differential operational amplifier (7) is connected to its non-inverting output, non-inverting auxiliary input (23) of first port of multi-differential operational amplifier (7) is connected to inverting output of first (5) differential operational amplifier, inverting additional input (24) of second port of multi-differential operational amplifier (7) is connected to non-inverting output of first (5) differential operational amplifier, main inverting input (9) of first port of multi-differential operational amplifier (7) is connected to first (1) input of device, main non-inverting input (10) of second port of multi-differential operational amplifier (7) is connected to second (2) input of device, inverting additional input (25) of first port of multi-differential operational amplifier (7) and non-inverting additional input (26) of second port of multi-differential operational amplifier (7) are connected to common bus of power supply (27).
EFFECT: technical result consists in providing conditions under which the frequency of the LPF transfer at zero frequency when changing the cutoff frequency remains unchanged.
1 cl, 4 dwg
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