High efficiency dual mode power amplifier apparatus

Details High efficiency dual mode power amplifier apparatus High efficiency dual mode power amplifier apparatus

1992-03-13

1993-10-05

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

455 74, 455 93, 375 5, 330297, H04B 104, H04B 140, H03F 304

Patent

active

052513319

ABSTRACT:
The dual mode power amplifier apparatus of the present invention is comprised of a number of power amplifiers (101-103) coupled to a voltage convertor (104) through their collector supply lines. A mode select line (105) is connected to the voltage convertor (104) to select a digital or analog mode. The preferred embodiment of the present invention is used in a hybrid digital/analog radiotelephone. In the digital mode, the voltage convertor (104) is turned off and the voltage convertor (104) supply voltage is allowed through to the collectors of the power amplifiers (101-103). This permits the power amplifiers (101-103) to operate with optimum linearity in a digital transmission environment. In an analog environment, the voltage convertor (104) is on and supplying a reduced voltage to the power amplifiers (101-103) allowing more efficient operation in this mode.

REFERENCES:
patent: 4870698 (1989-09-01), Katsuyama et al.
patent: 4994757 (1991-02-01), Bickley et al.
patent: 5060294 (1991-10-01), Schwent
patent: 5126688 (1992-06-01), Nakanishi et al.
patent: 5168516 (1992-12-01), Ito
patent: 5175871 (1992-12-01), Kunkel

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