High Efficiency, low distortion amplifier

Details High Efficiency, low distortion amplifier High Efficiency, low distortion amplifier

1986-03-11

1987-08-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330156, 330297, H03F 330

Patent

active

046880011

ABSTRACT:
A high efficiency class-G amplifier comprises first (2), second (4) and third (10) terminals connected to a load, a first (V.sub.1) and second (V.sub.2) supply voltage, respectively, where voltage V.sub.2 >V.sub.1. First (T.sub.1) and second (T.sub.2) transistors are serially connected between the first and third terminals. A third transistor (T.sub.3, emitter-follower) couples a signal input terminal (6) to the base of the first transistor. A first diode (D.sub.1) connects the collector of T.sub.1 to the second terminal. A driver circuit includes a current path between the third terminal and a common terminal (11) having, in series, a first current source (7), second (D.sub.2) and third (D.sub.3) diodes and a second current source (8). A fourth diode (D.sub.4) connects junction point 3 to junction point 9. A fifth diode (D.sub.5) connects the emitter of the third transistor to the second current source. A low input voltage cuts off the second transistor, which connects the first transistor to the first supply voltage via the first diode. At a given higher input voltage, the driver circuit drives the second transistor into conduction thereby coupling the first transistor to the second supply voltage. The output (2) thus can reach a voltage equal to the second supply voltage (V.sub.2) minus one B/E voltage.

REFERENCES:
patent: 3961280 (1976-06-01), Sampei

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