ADJUSTABLE ARC FILTER Russian patent published in 1998 - IPC

FIELD: radio engineering; selective radio electronic, including microelectronic, devices. SUBSTANCE: filter has first and second resistors 1, 2, first and second operational amplifiers 3, 4 third and fourth resistors 5, 6, third operational amplifier 7, fifth, sixth, seventh, and eighth resistors 8-11, fourth operational amplifier 12, first and second capacitors 13, 14 first and second numeric-control conductors 15, 16, ninth, tenth, eleventh, and twelfth resistors 17-20. EFFECT: extended operating frequency range and enlarged functional capabilities. 3 cl, 4 dwg , 2 tbl