Apparatus for efficient current amplification

Details Apparatus for efficient current amplification Apparatus for efficient current amplification

1997-07-28

1999-03-23

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330295, H03F 345, H03F 368

Patent

active

058865772

ABSTRACT:
Two emitter follower transistors (260, 250), in which each transistor has an emitter coupled to one of the collectors of a differential pair structure (230, 240)to form two stacked transistor pairs (260, 230) and (250, 240). A first differential signal (IN, INX) is positive supply referenced (Vcc) and is coupled to the bases of the emitter follower transistors (250, 260). A second differential input signal (275, 295) is coupled to the bases of the differential pair transistors (230, 240). The second differential input signal (275, 295) is identical to the first input signal but also includes a voltage level shift from the positive supply (Vcc). The first and second input signal portions are coupled to the transistors which make up the stacked transistor pair (260, 230) and (250, 240) and are chosen so that they are 180 degrees out of phase.

REFERENCES:
patent: 5440271 (1995-08-01), Laws

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