FIELD: radio engineering; high-selectivity channel-forming equipment of dynamic and frequency bands.
SUBSTANCE: in order to reduce transfer function sensitivity to deviations in parameters of amplifiers, amplifier 6 is inserted between connection point of third resistor 4, capacitor 10 of third-order RC bridge, and amplifier 7, and following feedback circuits are introduced: output of amplifier 6 is connected through second capacitor 9 to point of connection of bridge second and third resistors 3 and 4, respectively; second lead of third capacitor 10 of bridge is connected to output of amplifier 7 that functions as output 11 of low-pass filter; output 11 of the latter is connected through parallel-connected fourth resistor 5 and first capacitor 8 of bridge to common point of first and second resistors of bridge, respectively.
EFFECT: enlarged dynamic and frequency bands of low-pass filter.
1 cl, 3 dwg
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