FIELD: radio electronics; main selective filters for professional transceiver equipment. SUBSTANCE: filter has first and second operational amplifiers 1, 2 with resistive negative feedback circuits 3, 4. Inverting input of operational amplifier 1 is connected through first resistor 5 to common bus, Output of operational amplifier 1 is connected through second resistor 6 to inverting input of operational amplifier 2. Output of operational amplifier 2 functions as filter output. Noninverting inputs of operational amplifiers 1 and 2 are connected through third and fourth resistors 7 and 8, respectively, to potential input bus terminal of filter. Noninverting inputs of operational amplifiers 1 and 2 are connected through first and second piezoelectric resonators, respectively, to common bus; noninverting input and output of operational amplifier 1 are interconnected through additional capacitor 11. EFFECT: enlarged passband width of filter. 1 dwg
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