High efficiency dual mode power amplifier apparatus

H - Electricity – 03 – F

Patent

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Details

H03F 3/34 (2006.01) H03G 3/00 (2006.01) H03G 3/20 (2006.01)

Patent

CA 2109410

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.

L'invention est un amplificateur de puissance bimode comportant un certain nombre d'amplificateurs de puissance (101-103) couplés à convertisseur de tension (104) par l'intermédiaire de leurs lignes d'alimentation de collecteur. Une ligne de sélection de mode (105) est connectée au convertisseur de tension (104) pour choisir le mode numérique ou le mode analogique. La concrétisation privilégiée de la présente invention est utilisée dans un radiotéléphone hybride numérique-analogique. Dans le mode numérique, le convertisseur de tension (104) est hors fonction et sa tension d'alimentation est transmise aux collecteurs des amplificateurs de puissance (101-103). Dans le mode analogique, le convertisseur de tension (104) est en fonction et fournit une tension réduite aux amplificateurs de puissance (101-103), ce qui procure alors une plus grande efficacité de fonctionnement.

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