Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1977-03-18
1978-09-19
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330267, 330273, H03F 304
Patent
active
041157427
ABSTRACT:
An emitter follower type power amplifier capable of changing over supply voltage and hence the load line, comprising: an amplifying transistor of saturating type; at least a first and a second supply voltage source; a switching transistor having, a collector connected to the first supply voltage source, and an emitter connected to the second supply voltage source via a diode and also to the collector of said power amplifying transistor; a load resistor connected between the emitter of the power amplifying transistor and the ground; and a biasing voltage source connected between the base of the switching transistor and the emitter of the power amplifying transistor. This power amplifier circuit arrangement allows switching-over between load lines for small signal region and large signal region thereby enabling large signal amplification and reducing the collector loss of the power amplifying transistor. This circuit arrangement is also used in a push-pull power amplifying circuit to obtain the same advantage.
REFERENCES:
patent: 3772606 (1973-11-01), Waener
patent: 3858119 (1974-12-01), Engelhardt
patent: 4001707 (1977-01-01), Iguchi
patent: 4027270 (1977-05-01), Pitel
Dahl Lawrence J.
Nippon Gakki Seizo Kabushiki Kaisha
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