In-line, unbalanced amplifier, pre-distortion circuit

H - Electricity – 03 – F

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Details

H03F 1/32 (2006.01) H03F 3/60 (2006.01)

Patent

CA 2344263

A plurality of amplifiers are connected in cascade to form an in-line pre- distortion circuit. The amplifiers are unbalanced in that each amplifier stage in the circuit has two DC voltage rails which are independently controlled to provide different, i.e. offset, DC voltage levels to the unbalanced amplifiers. This unbalance in the amplifiers generates pre-distortion in a signal which can be used to cancel the inherent distortion caused by a non-linear device which subsequently processes or transmits the pre-distorted signal. Control of the DC voltage offset in at least one of the amplifier stages is necessary to match the pre-distortion to the inherent distortion being corrected. A tilt circuit can be used in cascade with the plurality of amplifiers (in front of the RF amplifiers) to compensate the amplitude change caused by the unbalanced RF amplifiers. Either side of the DC voltage can be changed in order to correct for either sublinear or superlinear laser diode curves.

On connecte en cascade plusieurs amplificateurs pour former un circuit de pré-distorsion en ligne. Le amplificateurs sont non équilibrés en ce que chaque étage d'amplification dans le circuit possède deux pôles à tension en courant continu qui sont indépendamment commandés pour fournir des niveaux de tension en courant continu différents, c.-à-d. décalés. Ce non équilibre des amplificateurs génère une pré-distorsion d'un signal pouvant s'utiliser pour annuler la distorsion inhérente provoquée par un dispositif non linéaire qui traite ou transmet par la suite le signal de pré-distorsion. La commande du décalage de la tension en courant continu dans au moins un des étages d'amplification est nécessaire pour adapter la pré-distorsion à la distorsion inhérente corrigée. On peut utiliser en cascade un circuit incliné avec les multiples amplificateurs (à l'avant des amplificateurs de fréquences radioélectriques) pour compenser le changement d'amplitude provoqué par les amplificateurs de fréquences radioélectriques non équilibrés. On peut modifier n'importe quel côté de la tension en courant continu pour corriger des courbes de diode laser sous-linéaires ou surlinéaires.

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