Power amplifier with variable input voltage source

Details Power amplifier with variable input voltage source Power amplifier with variable input voltage source

1998-07-31

2000-05-16

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

330285, H03F 304

Patent

active

060642696

ABSTRACT:
A power amplifier circuit (10) utilizes a step-wise variable voltage source (22) to improve amplifier (14) operating efficiency. In one preferred embodiment, an input signal to the step-wise variable voltage source is obtained by observing an operating characteristic of the amplifier. In an alternate preferred embodiment of the present invention, a characteristic of the input signal driving the amplifier stage is used to form an input signal to the step-wise variable input voltage source.

REFERENCES:
patent: 3478275 (1969-11-01), Walker
patent: 3486128 (1969-12-01), Lohrmann
patent: 4873493 (1989-10-01), Fujiwara

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