BUFFER AMPLIFIER Russian patent published in 2012 - IPC H03F3/26 H03F3/50 

FIELD: electricity.

SUBSTANCE: finally it expands the range of the device linear operation. The buffer amplifier comprises the first (1) and second (2) input transistors, bases of which are connected to an input (3) of the device, the emitter of the first (1) input transistor is connected to the base of the first (4) output transistor and the collector of the input transistor (5) of the first controlled source of current, the emitter of the second (2) input transistor is connected to the base of the second (6) output transistor and the collector of the input transistor (7) of the second source of current, besides, the emitter of the first (4) and second (6) output transistors are connected to the output (8) of the device, the first (9) source of supply voltage, to which the emitter of the input transistor (5) of the controlled source of current and the collector of the first (4) output transistor, the second (10) source of supply voltage, to which the emitter of the input transistor (7) of the second controlled source of current and the collector of the second (6) output transistor are connected. The circuit includes the first (11) and the second (12) additional transistors, bases of which are connected to the input (3) of the device, the collector of the first (11) additional transistor is connected to the base of the input transistor (5) of the first controlled source of current, and its emitter is connected to the collector of the first (1) input transistor and the first (13) additional current-stabilising dipole, the collector of the second (12) additional transistor is connected to the base of the input transistor (7) of the second controlled source of current, and its emitter is connected to the collector of the second (12) input transistor and the second (14) additional current-stabilising dipole.

EFFECT: increased maximum possible current in a low-resistance load at low current values consumed by a buffer amplifier from sources of supply in a static mode.

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