High efficiency variable power amplifier

Details High efficiency variable power amplifier High efficiency variable power amplifier

1988-12-29

1990-06-19

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330285, 330310, H03F 368

Patent

active

049357050

ABSTRACT:
A high efficiency variable power amplifier suitable for use in a battery powered device is provided wherein a variable power amplifier has at least a first (2) and a second (12) amplification stage. Base bias potential (8) for the second amplification stage (12) is derived from the bias potential provided to the first amplification stage. In this way, as the bias potential to the first amplification stage is modified to vary the output power, the base bias potential for the second amplification stage is correspondingly modified to maintain the amplifier's efficiency.

REFERENCES:
patent: 3825851 (1974-07-01), Smith
patent: 4313210 (1982-01-01), Hume et al.
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4727337 (1988-02-01), Jason
patent: 4728905 (1988-03-01), Zhiwei
68P81044C05-0, Motorola Theory/Maintenance Saber.TM. Manual, 1989, p. 13.
68P81055C25-0, Motorola MX1000 Service Manual, 1988, p. 27.

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