OUTPUT CASCADE OF OPERATIONAL AMPLIFIER Russian patent published in 2007 - IPC H03F3/30 H03F3/26 

FIELD: structure of analog microchips of varying functional purpose.

SUBSTANCE: output cascade of operational amplifier, containing input p-n-p (1) and n-p-n (2) transistors, bases of which are connected to each other, emitters are connected to first (3) and second (4) current sources and bases of output n-p-n (5) and p-n-p (6) transistors, where emitters of output (5) and (6) transistors are connected to load (7), which is different because circuit additionally contains first (8) p-n-p transistor based and second (9) n-p-n transistor based current mirrors, collector of output transistor (5) is connected to collector output of first current mirror (8), collector of output transistor (6) is connected to collector output of second current mirror (9), where aforementioned output transistors (5) and (6) are connected via corresponding first (8) and second (9) current mirrors to power buses, input (10) of first current mirror (8) is connected to output of first source of support current (11), and input (12) of second current mirror (9) is connected to output of second source of support current (13).

EFFECT: ensured load current protection.

10 cl, 12 dwg