Method and apparatus for multi-loop feedforward power...

H - Electricity – 03 – F

Patent

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H03F 1/32 (2006.01) H03F 1/02 (2006.01)

Patent

CA 2170894

A feedforward distortion minimization circuit includes a first loop with an input splitter (305) and first and second signal paths, each signal path having an amplifier (316, 334). An output combiner (335) couples the two signal paths and has an output signal path and an output dump load path. A first signal detector (336) on the dump load path detects a dump load signal, and in response a gain and phase controller (350) operates to adjust the gain and phase of a first signal on one of two signal paths to minimize the power delivered to the dump load (338). The feedforward circuit also includes embodiments in which both amplifiers operate at around the same power amplification level, and in which a second loop has an error amplifier (362) for further distortion correction.

Circuit d'atténuation de distortion par action anticipée, comprenant une première boucle dotée d'un diviseur d'entrée (305) et d'une première et deuxième voie de signaux, chaque voie comportant un amplificateur (316, 334). Un combineur de sortie (335), qui relie les deux voies de signaux, comprend une voie de sortie de signaux et une voie de vidage de sortie. Un premier détecteur de signaux (336) sur la voie de vidage détecte un signal de vidage et, en réponse, un régulateur de gain et de phase (350) intervient pour régler le gain et la phase d'un premier signal sur l'une des deux voies de signaux, de manière à réduire au minimum la puissance appliquée au vidage (338). Le circuit à action anticipée revêt également des configurations selon lesquelles les deux amplificateurs fonctionnent sensiblement au même niveau d'amplification de puissance et une deuxième boucle comporte un amplificateur d'erreur (362) permettant de corriger encore la distorsion.

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