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

FIELD: radio engineering and communications, for usage as output device (buffer amplifier) for amplification of analog signals in structure of analog microchips of various functional purpose.

SUBSTANCE: output cascade of operational amplifier contains 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, while emitters of output n-p-n (5) and p-n-p (6) transistors are connected to load (7), and their collectors are connected to corresponding power buses (8) and (9). Emitters of output n-p-n (5) and p-n-p (6) transistors are connected to load (7) through first (10) and second (11) current mirrors, controlling current inputs of which (12) and (13) are connected to outputs of first (14) and second (15) sources of supporting current.

EFFECT: limitation of output current on achievement of given current, value of which may be set by change of certain supporting current.

6 cl, 11 dwg