Transmit sequencing

Details Transmit sequencing Transmit sequencing

H - Electricity

04

B

H04B 15/04 (2006.01) H03L 3/00 (2006.01) H03L 7/107 (2006.01) H04B 7/005 (2006.01) H04B 1/54 (2006.01)

Patent

CA 2251845

A method and apparatus for initializing a radio transmission apparatus comprising a voltage control oscillator, a phase lock loop, and a power amplifier is disclosed so as to avoid generating unwanted interference in neighboring radio channels. First, the voltage control oscillator is enabled and the phase locked loop is switched from a narrow band mode to a wide bandwidth mode to give faster settling time and reduced overshoot. The power amplifier is then smoothly camped up to a final power level. Finally, the phase locked loop is switched from the wide bandwidth mode to the narrow bandwidth mode after the power amplifier has substantially reached the final power level.

L'invention concerne un procédé et un appareil pour initialiser un appareil d'émission radio comprenant un oscillateur commandé en tension, une boucle à verrouillage de phase et un amplificateur de puissance, ce qui empêche la génération d'interférences indésirables dans les canaux radio voisins. L'oscillateur commandé en tension est d'abord validé et la boucle à verrouillage de phase est commutée d'un mode bande étroite en un mode bande large de sorte que le temps d'établissement soit plus court et que les dépassements soient réduits. L'amplificateur de puissance est alors monté progressivement jusqu'au niveau de puissance finale. Enfin, lorsque l'amplificateur de puissance a atteint sensiblement le niveau de puissance finale, la boucle à verrouillage de phase est commutée d'un mode bande large en un mode bande étroite.

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