An amplifier circuit and a method of controlling an...

H - Electricity – 03 – F

Patent

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Details

H03F 1/00 (2006.01)

Patent

CA 2203556

An amplifier circuit (100) for use in a radio frequency system. The circuit is comprised of a first amplifier (22) having a first input (20) receiving a first signal (16) and a first output (24). A first coupler (18) samples the first input (20) of the first amplifier (22) and a second coupler (26) samples the first output (24) of the first amplifier (22). A third coupler (36) then compares an output of the second coupler (28) and an output of the first coupler (34), producing an error signal (38) which is substantially indicative of the difference between the first input (20) and the first output (24). A fourth coupler (44) combines the error signal (38) with a second signal (48) to produce a composite signal (50), the second signal (48) at least partially correlated with the first signal (16) received by the first input (20) of the first amplifier. A second amplifier (52) is responsive to the composite signal (50) and produces a second output (54).

L'invention est un circuit amplificateur (100) pour les systèmes radiofréquence. Le circuit est constitué d'un premier amplificateur (22) ayant une entrée (20) qui sert à recevoir un signal (16), et une sortie (24). Un premier coupleur (18) échantillonne le signal à l'entrée (20) du premier amplificateur (22) et un deuxième coupleur (26) échantillonne le signal à la sortie (24) du premier amplificateur (22). Un troisième coupleur (36) compare alors le signal de sortie du deuxième coupleur (28) et le signal de sortie du premier coupleur (34) et produit un signal d'erreur (38) qui correspond essentiellement à la différence entre le signal à l'entrée (20) et le signal à la sortie (24) du premier amplificateur. Un quatrième coupleur (44) combine le signal d'erreur (38) avec un second signal (48) pour produire un signal composite (50), le second signal (48) étant au moins partiellement corrélé avec le signal (16) reçu à l'entrée (20) du premier amplificateur. Le second amplificateur (52) réagit à la réception du signal composite (50) et produit un second signal (54).

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