Circuits for use in radio communications

Details Circuits for use in radio communications Circuits for use in radio communications

H - Electricity

03

L

H03L 7/087 (2006.01) H03L 7/113 (2006.01) H03L 7/18 (2006.01) H03L 7/185 (2006.01) H03L 7/20 (2006.01)

Patent

CA 2562752

A frequency synthesiser circuit for use in wireless communications including a phase locked loop including a VCO (voltage controlled oscillator), wherein the synthesiser circuit includes a further oscillator which in operation is a free running oscillator at a frequency higher than the VCO and a mixer connected to receive input signals from the VCO and from the further oscillator and to combine such signals. Also described is a wireless communications transmitter or receiver incorporating the frequency synthesiser circuit.

L'invention concerne un circuit synthétiseur de fréquence utilisé dans des communications sans fil comportant une boucle à phase asservie comprenant un oscillateur à tension variable (VCO). Le circuit synthétiseur comporte un autre oscillateur qui, en fonctionnement, est un oscillateur libre à une fréquence supérieure à celle du VCO et un mélangeur relié de manière à recevoir des signaux d'entrée provenant du VCO et de l'autre oscillateur et à combiner ces signaux. L'invention concerne également un émetteur ou un récepteur de communications sans fil renfermant ledit circuit synthétiseur de fréquence.

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