Intermodulation compensation in multi-channel amplifiers

H - Electricity – 03 – F

Patent

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Details

IPC codes

H03F 1/32 (2006.01)

Type

Patent

Patent number

CA 2274914

Description

A multi-channel transmit amplifier array comprising a multiplicity N of coupled power amplifier elements is disclosed. The number of channels provided for amplifying desired signals for transmission is less than N, by at least one. In this case, the unused channel is used to inject an intermodulation compensation waveform specifically tailored to reduce intermodulation generated in all of the other N-1 signal paths. Instantaneous complex waveform values for the intermodulation compensation waveform may be systematically computed from the instantaneous complex values of the N-1 desired signals in such a way as to minimize the greatest signal amplitude in any of the N signal paths.

Cette invention concerne un réseau d'amplificateurs d'émission multicanaux comprenant une pluralité N d'éléments d'amplificateurs de puissance couplés. Le nombre de canaux utilisés pour amplifier des signaux désirés devant être transmis est inférieur à N d'au moins une unité. Dans ce cas, le canal non utilisé sert à injecter une onde de compensation d'intermodulation spécifiquement déterminée pour réduire l'intermodulation générée dans toutes les autres N-1 voies pour le signal. Des valeurs d'ondes complexes instantanées pour l'onde de compensation d'intermodulation peuvent être systématiquement calculées à partir des valeurs complexes instantanées des N-1 signaux désirés, de manière à réduire au minimum la plus grande amplitude du signal dans n'importe laquelle des N voies pour le signal.

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