Direct conversion rf schemes using a virtually generated...

H - Electricity – 04 – B

Patent

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H04B 1/30 (2006.01) H03D 3/00 (2006.01) H03D 7/16 (2006.01) H04B 1/04 (2006.01) H04B 1/00 (2006.01)

Patent

CA 2281236

This inventions has applications in RF receivers and transmitters. The patent describes a method of removing the LO-leakage problem associated with direct RF receiver or transmitter topologies. This problem is solved by generating a virtual LO signal within the RF signal path. The LO signal is constructed by using signals that do not contain a significant amount of power (or no power at all) at the LO frequency required. Any errors added to the wanted LO in the new topology are minimized using a closed loop.

Cette invention présente des applications dans les récepteurs et les émetteurs RF. Le brevet décrit une méthode d'élimination du problème de fuite d'un oscillateur local associé aux topologies directes des émeteurs et récepteurs RF. Ce problème est réglé en générant un signal virtuel d'oscillateur local dans le parcours du signal RF. Le signal d'oscillateur local est produit en utilisant des signau qui ne contiennent pas une quantité importante d'énergie (ou qui ne contiennent aucune énergie) à la fréquence d'oscillateur local requise. Toute erreur ajoutée à l'oscillateur local voulu dans la nouvelle topologie est minimisée au moyen d'une boucle fermée.

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