Frequency translator using a non-periodic local oscillator...

H - Electricity – 04 – B

Patent

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

Patent

CA 2381997

This patent describes a method of removing the LO-leakage and 1/f noise problems associated with direct conversion RF receivers and other demodulators. In order to solve this problem a virtual LO.TM. signal is generated within the RF signal path which is tuned to the incoming RF signal. The virtual local oscillator (VLO) signal is constructed using signals that do not contain a significant amount of power (or no power at all) at the LO frequency. Any errors in generating the virtual LO signal are minimized using a closed loop correction scheme.

Ce brevet concerne un procédé d'élimination de la fuite de l'oscillateur local (LO) et de résolution des problèmes de bruit 1/f associés aux récepteurs RF à conversion directe et autres démodulateurs. Afin de résoudre ce problème un signal LO<TM> virtuel est généré à l'intérieur du chemin du signal RF lequel est accordé au signal RF entrant. Le signal de l'oscillateur local virtuel VLO est construit à l'aide de signaux ne contenant pas une quantité significative de puissance (ou pas de puissance du tout) à la fréquence LO. Les éventuelles erreurs dans la production du signal LO virtuel sont réduites au minimum à l'aide d'une méthode de correction en boucle fermée.

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