Out-of-band compensation for non-linear device

H - Electricity – 03 – F

Patent

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H03F 3/24 (2006.01) H03F 1/32 (2006.01) H03G 3/20 (2006.01) H04B 15/00 (2006.01) H04B 1/69 (2006.01)

Patent

CA 2214124

A system for substantially eliminating nonlinear distortion, such as intermodulation products, introduced when a signal is processed by a nonlinear device (106). The system adds an out-of-band signal (111) to an input signal (101) to produce a combined signal (105) having a power that substantially equals a nominal operating point power for a nonlinear device (106). Preferably, the instantaneous power of the out-of-band signal (111) is adjusted by an automatic gain amplifier (120). The combined signal (105) is input to the nonlinear device (106) to produce an output. A filter (108) processes the output of the nonlinear device (106) to recover the information content of the original signal (101) after processing by the nonlinear device (106). For example, if the nonlinear device (106) is a power amplifier, the filtered output (109) is an amplification of the input signal (101).

Système pour sensiblement éliminer la distorsion non linéaire, telle que les produits d'intermodulation, introduite lorsqu'un signal est traité par un dispositif non linéaire (106). Le système ajoute un signal hors bande (111) à un signal d'entrée (101) pour produire un signal combiné (105) ayant une puissance sensiblement égale à la puissance du point de fonctionnement nominal pour un dispositif non linéaire (106). De préférence, la puissance instantanée du signal hors bande (111) est ajustée par un amplificateur de gain automatique (120). Le signal combiné (105) est envoyé au dispositif non linéaire (106) de sorte qu'une sortie soit produite. Un filtre (108) traite la sortie du dispositif non linéaire (106) pour récupérer la teneur en information du signal d'origine (101) après traitement par le dispositif non linéaire (106). Par exemple, si le dispositif non linéaire (106) est un amplificateur de puissance, la sortie (109) après filtrage est une amplification du signal d'entrée (101).

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