Multi-mode communications system with efficient oscillator...

Details Multi-mode communications system with efficient oscillator... Multi-mode communications system with efficient oscillator...

H - Electricity

04

B

H04B 1/40 (2006.01) H03J 1/00 (2006.01) H03J 7/06 (2006.01) H04B 1/26 (2006.01) H04B 1/38 (2006.01) H04B 7/26 (2006.01)

Patent

CA 2387769

A wireless communication device (40) can operate in either of two modes. In the first mode, a first frequency turner (52) locks a first oscillator (60) onto a received signal, received from an antenna (12) via a first receive chain (44). This locking also adjusts the frequency used in the first transmit chain (48). When the device is to be switched to the second mode, a system control computer (56) first servos a second frequency turner (64) so that a desired ratio is obtained. This ratio is the ratio of the frequency of a second oscillator (68) to the adjusted frequency of the first oscillator. This servoing allows the device, and particularly the second receive chain (46) and the second transmit chain (50), to enter the second mode more quickly and accurately.

L'invention concerne un dispositif (40) de communication sans fil pouvant fonctionner selon deux modes. Selon le premier mode, un syntoniseur (52) de fréquence bloque un premier oscillateur (60) sur un signal reçu d'une antenne (12) via une première chaîne (44) de réception. Ce blocage permet également de régler la fréquence utilisée dans la première chaîne (48) d'émission. Lorsque le dispositif doit passer en second mode, un ordinateur (56) de commande du système asservit tout d'abord un second syntoniseur (64) de fréquence de manière à obtenir un rapport voulu. Ledit rapport est celui de la fréquence du second oscillateur (68) sur la fréquence réglée du premier oscillateur. Cette opération d'asservissement permet au dispositif, et notamment à la seconde chaîne (46) de réception et à la seconde chaîne (50) d'émission de passer, plus rapidement et de manière plus précise, en second mode.

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