CASCODE DIFFERENTIAL AMPLIFIER WITH INCREASED INPUT DIFFERENTIAL RESISTANCE Russian patent published in 2010 - IPC H03F3/45 H03F1/56 

FIELD: radio engineering.

SUBSTANCE: cascode differential amplifier (CDA) comprises input parallel-balance cascade (PBC) (1), having the first (2) and second (3) inputs, the first (4) and second (5) current outputs connected to emitters of the first (6) and second (7) output transistors (T) with combined bases. Circuit additionally includes a current mirror (CM) (8), combined bases of T (6) and T (7) are connected to input of CM (8), and its output is connected to combined emitters of the first (9) and second (10) auxiliary T, besides base T (9) and collector T (10) are connected to the first input (2) of PBC (1), and base T (10) and collector T (9) are connected to the second (3) input of PBC (1).

EFFECT: improved input resistance.

2 cl, 12 dwg