DIFFERENTIAL AMPLIFIER Russian patent published in 2010 - IPC H03F3/45 H03F1/56 

FIELD: radio engineering.

SUBSTANCE: differential amplifier (DA) comprises input parallel-balance cascade (1), having the first (2) and second (3) inputs, the first (4) and second (5) current outputs connected to the first (6) and second (7) two-terminal networks of load, having common unit. Circuit includes the first (8) additional transistor (T), emitter of which is connected to common unit of the first (6) and second (7) two-terminal networks of load, base is connected to input of additional current mirror (9), output of which is connected to input (10) of additional current divider, the first (12) output of additional current divider (10) is connected to the first (2) input of input parallel-balance cascade (1), and its second (13) output is connected to the second (3) input of input parallel-balance cascade (1).

EFFECT: improved input resistance.

4 cl, 12 dwg