INPUT STAGE OF HIGH-SPEED OPERATIONAL AMPLIFIER Russian patent published in 2014 - IPC H03F3/34 

FIELD: radio engineering, communication.

SUBSTANCE: input stage of the operational amplifier comprises first (1) and second (2) input transistors, first (3) and second (4) output transistors, first (5) and second (6) auxiliary transistors, first (7) and second (8) device inputs, first (9) and second (10) forward-biased p-n junctions, a first (11) current-stabilising two-terminal device, current outputs of the device (12), (13), (14), (15), first (16) power supply bus, where between the second (10) p-n junction, connected to the emitter of the second (6) transistor, and a second (17) power supply bus, there is a first (11) two-terminal device connected, between the first (9) p-n junction, connected to the emitter of the first (5) transistor, and the second (17) power supply bus, there is a second (18) two-terminal device connected, between the common node (19) of the first (9) p-n junction and the second (18) two-terminal device, as well as the common node (20) of the second (12) p-n junction and the first (11) two-terminal device, there are series-connected third (21) and fourth (22) resistors, the common node (23) of which is connected to the bases of the first (3) and second (4) input transistors.

EFFECT: wider range of active operation of the input stage of the operational amplifier for a differential signal.

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