ACTIVE RC PHASE CIRCUIT Russian patent published in 1994 - IPC

FIELD: radio engineering. SUBSTANCE: active RC phase circuit has first, second, third and fourth operational amplifiers 1, 2, 3, 4, first resistor 5, first capacitor 6, second, third and fourth resistors 7, 8, 9, second capacitor 10, sixth, seventh, eighth, ninth, tenth, eleventh and twelfth resistors 11-18. It is supplemented with fifth operational amplifier 19, thirteenth and fourteenth resistors 20 and 21. EFFECT: enhanced stability of phase-frequency characteristic by expansion of field of working frequencies due to decrease of effect of amplification area of used operational amplifiers on frequencies of poles and on zeroes of transfer function. 1 dwg