Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1986-03-11
1987-11-10
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330156, 330267, H03F 330
Patent
active
047060395
ABSTRACT:
A class-G amplifier comprises first, second and third terminals connected to a load, first supply voltage (V.sub.1) and second supply voltage (V.sub.2), respectively, where V.sub.2 >V.sub.1. First (T.sub.1) and second (T.sub.2) transistors are series-connected between the first and third terminals with the collector of T.sub.1 coupled via first diode (D.sub.1) to the second terminal. A third emitter follower transistor (T.sub.3) has a B/E junction coupled between a signal input terminal and base of T.sub.1. A first current source (5) couples the third terminal and third transistor. A driver circuit includes a first current path between the third terminal and emitter of T.sub.3 comprising, in series, a second current source (7), a fourth transistor (T.sub.5) and second diode (D.sub.4). A second current path between a junction point (3) and common point (11) comprises, in series, third (D.sub.2) and fourth (D.sub.3) diodes and a third current source (8). Base of fourth transistor is connected to junction (9) and its collector is connected to third current source via fifth diode (D.sub.5). A low input voltage cuts off second transistior so first transistor connected to second terminal. Above a given voltage, driver circuit turns second transistor on so first transistor connected to third terminal. The output (2) thereby attains a voltage equal to second supply voltage (V.sub.2) minus one B/E voltage.
REFERENCES:
patent: 3961280 (1976-06-01), Sampei
patent: 4115742 (1978-09-01), Yokoyama
Dijkmans Eise C.
Philips Norbert J. L.
Raets Joseph G. G.
Franzblau Bernard
Mayer Robert T.
Mullins James B.
U.S. Philips Corporation
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