Apparatus and method for pre-distortion correction of a...

H - Electricity – 03 – F

Patent

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H03F 1/32 (2006.01)

Patent

CA 2244640

Linear and non-linear distortion in high power amplifiers used in television and digital television transmitters and amplifiers cause unwanted inter modulation products. Spectral regrowth limits the maximum power available from the amplifying device and can render it useless. Spectral regrowth from the amplifying device is caused from deviations in the amplifiers ability to reproduce the input signal multiplied by its gain. These deviations are caused by AM to AM and AM to PM conversion within the amplifier. Linear distortions due to frequency response errors and phase response errors can exist in the amplifier. When multiple amplifiers are combined in parallel in high power systems, these linear distortions interact with the non-linear distortions and can make conventional pre-correction circuits ineffective. The invention provides a method and apparatus for compensating or pre-correcting these linear and non-linear distortions.

La distorsion linéaire et non linéaire dans les amplificateurs à grande puissance utilisés dans les amplificateurs et émetteurs de télévision et de télévision numérique causent des produits d'intermodulation non désirés. La recroissance spectrale limite le maximum de puissance du dispositif d'amplification et peut rendre ce dernier inutile. La recroissance spectrale provenant du dispositif d'amplification est due à des déviations de la capacité des amplificateurs à reproduire le signal d'entrée multiplié par son gain. Ces déviations sont causées par la conversion AM-AM et AM-PM à l'intérieur de l'amplificateur. Des distorsions linéaires dues à des erreurs de réponse en fréquence et à des erreurs de réponse en phase peuvent se produire dans l'amplificateur. Lorsque de multiples amplificateurs sont combinés en parallèle dans des systèmes à grande puissance, ces distorsions linéaires interagissent avec les distorsions non linéaires et peuvent rendre inefficaces les circuits de précorrection traditionnels. L'invention offre une méthode et un dispositif permettant de compenser ou de précorriger ces distorsions linéaires et non linéaires.

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