Active operating point regulation for power amplifiers

H - Electricity – 03 – F

Patent

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Details

H03F 1/08 (2006.01) H03F 1/30 (2006.01)

Patent

CA 2302692

The invention relates to an amplifier circuit comprising at least one power transistor (12), a circuit for compensating closed circuit drifts and optionally components for controlling the power transistor(s), characterized in that the circuit for compensating closed-circuit drifts has at least one reference voltage field effect transistor (23) with a gate electrode (22) mounted in the area of the electrodes of the power transistor(s) (5) and in that the reference voltage field effect transistor is located in a common chip area along with the power transistor(s) (12). The invention further relates to the use of the above-mentioned amplifier circuit in mobile radiotelephone facilities.

L'invention concerne un circuit amplificateur comprenant au moins un transistor d'étage de sortie (12), un circuit pour compenser des dérives de courant de repos, et éventuellement des composants pour commander le ou les transistors d'étage de sortie. Ce circuit amplificateur est caractérisé en ce que le circuit de compensation de dérives de courant de repos présente au moins un transistor à effet de champ à courant de référence (23) comportant une électrode de grille (22). Au moins une électrode de grille (22) est placée au niveau des électrodes du ou des transistors d'étage de sortie (5), et le ou les transistors à effet de champ à courant de référence (23) se trouvent sur une surface de puce commune (6, 8) avec le ou les transistors d'étage de sortie (12). L'invention concerne en outre l'utilisation de ce circuit amplificateur dans des installations radiotéléphoniques mobiles.

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