Power amplifier

H - Electricity – 03 – F

Patent

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Details

H03F 3/30 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2261145

A power amplifier designed for delivering high power to a load (LOAD) comprises an input stage (A1) that converts an input voltage (u1) to a current signal (iin) which is applied to an end stage comprising a current amplifier stage (A3, PA1, PA2) and a bypass-resistor (R). The output terminal (7) of the current amplifier stage is connected to earth, and the current supply (PS1, PS2) is arranged floating relative to signal earth, so that the power current signal through the load (LOAD) also passes through the current supply (PS1 or PS2). A correction amplifier (A2) is preferably connected so as to measure the voltage across the end stage (A3, PA1, PA2) and provide a correction current (ikorr) to balance the voltage difference across the current amplifier stage and remove the effect of non-linearities in the current amplifier stage.

Cette invention concerne un amplificateur de puissance qui permet d'appliquer une puissance élevée à une charge (LOAD). Cet amplificateur comprend un étage d'entrée (A1) qui va transformer une tension d'entrée (u¿i?) en un signal de courant (i¿in?). Ce signal est appliqué à un étage final qui comprend un étage amplificateur de courant (A3, PA1, PA2) ainsi qu'une résistance de dérivation (R). La borne de sortie (7) de l'étage amplificateur de courant est connectée à la terre, tandis que l'alimentation en courant (PS1, PS2) est flottante par rapport au signal terre, ceci de manière à ce que le signal de courant de puissance qui passe à travers la charge (LOAD) passe aussi à travers l'alimentation en courant (PS1 ou PS2). Un amplificateur de correction (A2) est de préférence connecté de manière à mesurer la tension qui traverse l'étage final (A3, PA1, PA2). Cet amplificateur de correction va fournir un courant de correction (i¿korr?) qui va équilibrer la différence de tension s'exerçant dans l'étage amplificateur de courant, et qui va éliminer dans ce dernier les effets de caractéristiques non linéaires.

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