Power amplifier and power amplification method

Details Power amplifier and power amplification method Power amplifier and power amplification method

1995-03-10

1996-08-13

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

455 93, 455127, H03F 304, H04B 104

Patent

active

055460518

ABSTRACT:
In a dual-mode radio telephone transmitter operative in both an analog modulation mode based on the FDMA system and a digital modulation mode based on the TDMA system, a DC bias voltage Vdd to be applied to a power amplification circuit is varied in accordance with the type of modulation, so that the input/output characteristics of the power amplification circuit can be optimized. To this end, a micro processor controls a switch interposed between the power amplification circuit and a positive DC power unit in such a manner that the DC bias voltage Vdd is 4.8 V for the FDMA mode, while the DC bias voltage Vdd is 6.0 V for the TDMA mode. The value of another DC bias voltage Vgg in the power amplification circuit is fixed. The value of the DC bias voltage Vdd is set higher in the TDMA mode than in the FDMA mode; thus, it becomes possible to increase the power added efficiency in the FDMA mode, without adversely affecting high linearity and high efficiency in the TDMA mode.

REFERENCES:
patent: 5179353 (1993-01-01), Miyake
patent: 5251331 (1993-10-01), Schwent et al.
patent: 5423078 (1995-06-01), Epperson et al.

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