Feed-forward amplifier with expanded linearity

H - Electricity – 03 – F

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H03F 1/00 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2157255

The compensation range of feed-forward amplifiers is expanded. The peak value of the input or output of an auxiliary amplifier 15 is detected with a peak power measuring instrument 24, and the characteristic of a distortion detecting loop 100 is controlled with a vector adjuster 3 and a control circuit 9 so as to minimize this peak value. By controlling the characteristic of the distortion detecting loop by detecting the peak value, the range of linearity compensation is expanded compared with conventional control based on the average level.

L'invention est une méthode d'expansion de la gamme de correction des amplificateurs à antéréaction. La valeur de crête du signal d'entrée ou de sortie d'un amplificateur auxiliaire 15 est détectée à l'aide d'un appareil de mesure de la puissance de crête 24 et la caractéristique d'une boucle de détection de distorsions 100 est contrôlée à l'aide d'un ajusteur vectoriel 3 et d'un circuit de commande 9 de façon à minimiser cette valeur de crête. En contrôlant la caractéristique de la boucle de détection de distorsions par une détection de la valeur de crête, on peut élargir la gamme de correction de la linéarité comparativement à la méthode de contrôle courante qui est basée sur le niveau moyen.

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