DIFFERENTIAL AMPLIFIER Russian patent published in 2011 - IPC H03F3/45 H03F3/189 

FIELD: electricity.

SUBSTANCE: differential amplifier (DA) includes input differential cascade (DC) (1) with the first (2) and the second (3) current outputs, the first (4) bus of power sources (PS) which is connected to emitter circuit of input DC (1), the first (5) resistor of collector load, the first output of which is connected to the first (6) output of device and the first (2) current output of input DC (1), the second (7) resistor of collector load, the first output of which is connected to the second (8) output of device and the second (3) current output of input DC (1), and the second (9) bus of PS. The second output of the first (5) resistor of collector load is connected to the second (9) bus of PS through the first (10) additional bipole and through the first (11) balancing capacitor to the input of the first (12) additional inverting current repeater (ICR), the second output of the second (7) resistor of collector load is connected to the second (9) bus of PS through the second (13) additional bipole and through the second (14) balancing capacitor to the input of the second (15) additional ICR; the output of the first (12) additional ICR is connected to the second (3) current output of input DC (1); output of the second (15) additional ICR is connected to the first (2) current output of input DC (1); at that, common emitter outputs of the first (12) and the second (15) additional ICR are connected to the first (4) bus of PS.

EFFECT: increasing limit values of amplification coefficient as to voltage of differential amplifier at low-voltage power supply and operation with variable HF and microwave signals.

3 cl, 6 dwg