Adaptive feed-forward method and apparatus for amplifier...

H - Electricity – 03 – F

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H03F 1/26 (2006.01) H03F 1/32 (2006.01) H03F 3/19 (2006.01)

Patent

CA 2083589

An adaptive feed-forward cancelling system obtains a reference signal and a sample signal from an amplifier by directional couplers. The sample signal essentially consists of an undistorted input signal component and a noise and distortion component. The reference and sample signals are provided to an adaptive interference canceller which performs an adaptive cancellation process. The interference canceller provides a cancellation signal essentially consisting of the signal component which is common to both the reference signal and the sample signal. The cancellation signal is injected into a transmission line which carries the sample signal so that only an error signal remains which essentially consists of the noise distortion component of the amplifier output signal. the error signal is then amplitude and phase adjusted to have substantially the same amplitude and to be substantially 180° out of phase with the amplifier output signal. The amplitude and phase adjustment error signal is then injected by a directional coupler onto the transmission line which carries the amplifier output signal so that an amplified input signal is provided by the power amplifier without the noise and distortion components added by the amplifier.

Un système d'annulation adaptatif sans rétroaction obtient d'un amplificateur un signal de référence et un signal échantillon au moyen de coupleurs directifs. Le signal échantillon comprend un signal d'entrée sans distorsion et une composante bruit/distorsion. Le signal de référence et le signal échantillon sont transmis à un annuleur de brouillage adaptatif qui exécute un processus d'annulation adaptative. L'annuleur de brouillage produit un signal d'annulation composé essentiellement de la composante de signal qui est commune au signal de référence et au signal échantillon. Le signal d'annulation est injecté dans une ligne de transmission qui achemine le signal échantillon de façon que seul demeure un signal d'erreur comprenant essentiellement la composante bruit/distorsion du signal de sortie d'amplificateur. Le signal d'erreur est alors réglé en amplitude et en phase de manière à avoir essentiellement la même amplitude et à être essentiellement décalé de 180~ par rapport au signal de sortie de l'amplificateur. Le signal d'erreur réglé en amplitude et en phase est ensuite injecté par un coupleur directif dans la ligne de transmission qui achemine le signal de sortie de l'amplificateur de manière que le signal de sortie amplifié soit exempt des composantes bruit/ distorsion ajoutées par l'amplificateur.

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