BROADBAND OPERATIONAL AMPLIFIER WITH DIFFERENTIAL OUTPUT Russian patent published in 2010 - IPC H03F3/45 

FIELD: radio engineering.

SUBSTANCE: broadband operational amplifier (BOA) with differential output comprises input differential cascade (DC) (1), having the first (2) and second (3) inputs, the first (4) and second (5) current outputs, and current input (6) in common emitter circuit, controlled reference current source (CRCS) (7), output of which is connected to current input (6), the first (8) and second (9) auxiliary transistors (T), bases of which are connected to shift voltage source (SVS) (10), collector T (8) is connected to the first (4) current output of DC (1), and emitter is connected to bus of supply source (11) through the first current-stabilising dipole (CD) (12), collector T (9) is connected to the second (5) current output of DC (1), and emitter is connected to bus of supply source (11) through the second CD (13), the first (14) and second (15) output T, the first (16) and second (17) resistors of load, connected to emitters of according T (14) and T (15) and first (18) and second (19) outputs of BOA, besides common point of the first (16) and second (17) load resistors is connected to input of CRCS (7), base T (14) is connected to the first (4) current output of DC (1), and base T (15) is connected to the second (5) current output of DC (1). The first input (2) of DC (1) is connected to emitter T (9) via the first (20) additional capacitor, and the second input (3) of DC (1) is connected to emitter T (8) via the second (21) additional capacitor.

EFFECT: expanded range of working frequencies.

2 cl, 6 dwg