Local oscillator leakage control in direct conversion processes

H - Electricity – 04 – B

Patent

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H04B 1/30 (2006.01) H03D 3/00 (2006.01) H04B 1/40 (2006.01) G01N 33/14 (2006.01)

Patent

CA 2434048

A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.

L'invention concerne un système et un procédé destinés à produire une fréquence d'oscillateur local (LO) dans un récepteur ou un émetteur à fréquence intermédiaire (IF) nulle. Un signal est reçu en provenance d'un oscillateur commandé en tension (VCO). Ce signal présente une fréquence VCO. La fréquence VCO est divisée par un nombre N, d'où la production d'un signal possédant une fréquence réduite par division. Le signal présentant la fréquence VCO est alors mélangé avec le signal à fréquence réduite par division, d'où la production d'un signal de sortie possédant une fréquence de sortie. On réduit ainsi le risque de fuite de l'oscillateur local. Par conséquent, le récepteur ou l'émetteur peut fonctionner dans des modes et des bandes de communication sans fil multiples en s'adaptant aux spécifications associées.

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