DIFFERENTIAL AMPLIFIER WITH PARAPHASE OUTPUT Russian patent published in 2011 - IPC H03F3/45 

FIELD: radio engineering.

SUBSTANCE: differential amplifier (DA) includes input parallel balance cascade (PBC) (1) the first (2) and the second (3) current outputs of which are connected to bases of the first (4) and the second (5) output transistors (T), the first (6) and the second (7) load bipoles (LB), output T (8) of current stabiliser the collector of which is connected to common emitter circuit (9) of input PBC (1), auxiliary bipole (B) (10) in-parallel connected to emitter-base transition of T (8) of current stabiliser, the first (11) and the second (12) feedback resistors the first outputs of which are connected to emitters of the appropriate first (4) and second (5) output T, as well as to the first (13) and the second (14) opposite phase outputs of DA, and the second outputs are connected to base of output T (8) of current stabiliser. To the scheme there introduced is the first (15) and the second (16) additional T, as well as the first (17) and the second (18) additional B, base of T (4) is connected to the first LB (6) and base of T (16) through the first (17) additional B, base of T (5) is connected to the second LB (7) and base of T (15) through the second (18) additional B, collector of T (4) is connected to emitter of T (15), collector of T (5) is connected to emitter of T (16); at that, collectors of T (15, 16) are connected to power supply bus.

EFFECT: increasing amplification coefficient as to voltage at low-resistance load.

11 dwg