DUAL-SPLIT ACTIVE PIEZOELECTRIC FILTER Russian patent published in 2002 - IPC

FIELD: radio electronics; communication radio receivers; instrumentation engineering. SUBSTANCE: filter has double-input and double-output adder 1 built around two negative-feedback operational amplifiers 2, 3. First input of adder 1 is connected through first and fifth piezoelectric resonators 12, 13 to input potential terminal of filter. Second input of adder 1 is also connected through second and sixth piezoelectric resonators 15, 16 to input potential terminal of filter. Third and seventh piezoelectric resonators 18, 21 are connected to first output of adder 1, their leads being connected, respectively, through twelfth and fourteenth resistors 20, 26 to first and second output potential terminals of filter. Fourth and eighth piezoelectric resonators 24, 27 are connected to second output of adder 1, their second leads being connected through fourteenth and eighteenth resistors 26, 29 to potential terminals of filter, respectively. Selecting frequency of first and third piezoelectric resonators 12, 18 equal to f₁, that of second and fourth piezoelectric resonators 15, 24, to f₂, frequency of fifth and seventh piezoelectric resonators 13, 21, to f₃, and that of sixth and eighth resonators 16, 27, to f₄ generates gain- frequency response with band ΔF₁ = f₂-f₁ across first output of filter and gain- frequency response with band f₄-f₃, across its second output. EFFECT: enhanced economic efficiency. 1 dwg