FIELD: radio engineering; selective units of adjustable-parameter electronic devices. SUBSTANCE: filter has first operational amplifier 1, first and second resistors 2 and 3, respectively, third operational amplifier 4, first capacitor 5, second capacitor 6, fifth operational amplifier 7, third resistor 8, first digital-to-analog converter 9, second operational amplifier 10, fourth resistor 11, second digital-to-analog converter 12, fourth operational amplifier 13, fifth resistor 14, sixth resistor 15, seventh resistor 16, sixth operational amplifier 17, eighth, eleventh, and twelfth resistors 18, 19, 20, respectively, third digital-to-analog converter 21, seventh operational amplifier 22, ninth and tenth resistors 23 and 24, respectively, and eighth operational amplifier 25. EFFECT: improved design. 7 dwg
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