An rf front end with reduced carrier leakage

H - Electricity – 04 – B

Patent

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Details

H04B 1/00 (2006.01) H04B 1/26 (2006.01) H04B 1/28 (2006.01) H04B 1/52 (2006.01)

Patent

CA 2492860

A method and apparatus that provide a frequency conversion in a radio frequency front-end are disclosed, including a frequency divider (407) that divides an input signal frequency by a predetermined value to produce an output signal frequency (417); and a frequency mixer (405, 406) that mixes the output signal frequency (417) with a carrier signal frequency to produce a converted signal frequency, which is substantially equal to a difference between the output signal frequency (417) and the carrier signal frequency. The predetermined value and the input signal frequency are selected such that the carrier signal frequency is not substantially equivalent to an integer multiple of the output signal frequency (417). The method and apparatus can be used in a wireless communication receiver including wireless communication systems and wireless LAN systems.

L'invention concerne un procédé et un dispositif effectuant une conversion de fréquence dans un frontal radiofréquence. Le dispositif selon l'invention comporte un diviseur de fréquence (407) divisant une fréquence de signal d'entrée par une valeur prédéterminée afin de produire une fréquence de signal de sortie (417), et un mélangeur de fréquence (405, 406) mélangeant la fréquence de signal de sortie (417) avec une fréquence de signal de porteuse afin de produire une fréquence de signal convertie, essentiellement égale à la différence entre la fréquence de signal de sortie (417) et la fréquence de signal de porteuse. La valeur prédéterminée et la fréquence de signal d'entrée sont choisies de manière que la fréquence de signal de porteuse soit différente d'un multiple entier de la fréquence de signal de sortie (417). Les procédé et dispositif selon l'invention peuvent être employés dans un récepteur de communication sans fil tel que des systèmes de communication sans fil et des systèmes de réseaux locaux sans fil.

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