Method and apparatus for linear amplification of a radio...

H - Electricity – 04 – B

Patent

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Details

H04B 1/04 (2006.01) H03F 1/02 (2006.01) H03F 1/32 (2006.01) H03F 1/56 (2006.01) H04L 27/36 (2006.01)

Patent

CA 2371792

A method and apparatus is provided that amplitude modulates a modulated radio frequency (RF) signal (411) by modulating the supply voltage of a power amplifier (410). The method and apparatus further provide an impedance modulator (412) that reduces output signal (415) errors in response to an error signal generated by a feedback circuit (416) that includes a quadrature modulator (506), a limiter (520), a comparator (502), and a quadrature downconverter (510). Intermodulation distortion generated in the feedback circuit (416) by delay mismatches between amplitude and phase feedback paths, and non-linear effects of AM/PM conversion in a limiter (520), are suppressed by placing limiter (520) and quadrature downconverter (510) in a forward path of the overall amplifier loop.

La présente invention concerne un procédé et un appareil de modulation d'amplitude d'un signal (411) de radiofréquence (RF), par modulation de la tension d'alimentation d'un amplificateur de puissance (410). De plus, le procédé et appareil selon l'invention fournissent un modulateur d'impédance (412) qui réduit des erreurs de signal de sortie (415), en réponse à un signal d'erreur produit par un circuit de réaction (416) qui comprend un modulateur en quadrature (506), un limiteur (520), un comparateur (502) et un convertisseur abaisseur de fréquence en quadrature (510). La distorsion d'intermodulation, produite dans le circuit de réaction (416) par décalage de retard entre les trajets de réaction d'amplitude et de phase, et des effets non linéaires de la conversion AM/PM dans un limiteur (520) sont supprimés par mise en place du limiteur (520) et du convertisseur abaisseur de fréquence en quadrature (510) dans un trajet avant de la boucle d'amplificateur complète.

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