DIFFERENTIAL AMPLIFIER CHARACTERIZED IN ENHANCED COMMON-MODE SIGNAL ATTENUATION Russian patent published in 2007 - IPC H03F3/45 

FIELD: radio engineering, analog signal amplifiers, various analog integrated circuits.

SUBSTANCE: proposed differential amplifier has input transistors 1, 2 with local feedback resistor 3 inserted between their emitters, first and second current mirrors 4 and 5 whose inputs 6,and 7 are coupled with collectors of input transistors 1 and 2 and outputs 8, 9 are connected to outputs 10, 11 of third and fourth current mirrors 12 and 13, respectively; emitters of input transistors 1, 2 are connected to first leads 14, 15 of current-regulating resistors 16, 17 whose second leads 18, 19 are connected to inputs 20, 21 of third and fourth current mirrors 12, 13, respectively; outputs of first and third current mirrors 4 and 12 are connected to first current input 22 of additional current adder 23; outputs 9 and 11 of second and fourth current mirrors 5 and 13 are connected to second current input 24 of current adder 23.

EFFECT: enhanced attenuation constant of input common-mode signal.

2 cl, 9 dwg