Adaptive biasing in a power amplifier

H - Electricity – 03 – F

Patent

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Details

H03F 1/26 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2293241

The invention relates to an amplifier arrangement for amplifying an input signal (20) using a distorting main power amplifier (14) such as one operating as a class AB amplifier. The amplifier can be biased at different operating points. The method and apparatus modify bias control signals to the main amplifier (14) to reduce or minimize the distortion energy added by the main power amplifier (14). A digitally controlled processor (90) iteratively modifies various control bias signals to adjust the output (18) of the amplifier. Different gain (26, 52, 60, 66) and phase (28, 62, 68) control elements can also be iteratively updated at different rates.

L'invention concerne un dispositif d'amplification permettant d'amplifier un signal (20) d'entrée au moyen d'un amplificateur (14) de puissance principal à distorsion, tel qu'un amplificateur fonctionnant en classe AB. Cet amplificateur peut être polarisé à différents points de fonctionnement. Le procédé et l'appareil permettent de modifier les signaux de commande de polarisation reçus par l'amplificateur principal (14), de façon à réduire ou minimiser l'énergie de distorsion ajoutée par l'amplificateur de puissance principal. Un processeur (90) à commande numérique modifie de façon itérative différents signaux de polarisation de commande, de façon à régler la sortie (18) de l'amplificateur. Différents éléements de commande de gain (26, 52, 60, 66) et de phase (28, 62, 68) peuvent également être mises à jour de façon itérative à différentes vitesses.

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