Method and apparatus for increasing amplifier efficiency

H - Electricity – 03 – F

Patent

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Details

H03F 1/02 (2006.01) H03G 3/00 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2160750

A transmitter (107) includes amplifying circuitry (203) and control circuitry (215, 217, 219) for biasing the amplifying circuitry (203) so that it operates closer to saturation with increased efficiency. The gate voltage signal (213), which provides a gate bias, is coupled to the amplifying circuitry (203) and is dynamically varied by the processor circuitry (219) in response to the value of the amplifier control voltage (211) coupled to the amplifying circuitry (203). The amplifier control voltage (211), which has a value for maintaining the output power of the amplifying circuitry (203) at a constant, is produced by the integrating circuitry (217) in response to a comparison of the detected power output signal (216) produced by the detecting circuitry (215) and the power output control signal (218) produced by the processor circuitry (219). Efficiency is realized by dynamically varying the gate voltage signal (213) to its largest magnitude so that the amplifying circuitry (203) may operate as close to saturation as possible while still maintaining a constant output power.

Un émetteur (107) comprend un circuit amplificateur (203) et un circuit de commande (215, 217 et 219) qui assure la polarisation du circuit amplificateur (203) de manière qu'il fonctionne plus proche du point de saturation, avec un rendement amélioré. Le signal de tension de grille (213), qui assure la polarisation de la grille, est relié au circuit amplificateur (203) et sa valeur est réglée dynamiquement par le circuit processeur (219) en réponse à la valeur de la tension de commande de l'amplificateur (211) reliée au circuit amplificateur (203). La tension de commande de l'amplificateur (211), dont la valeur est réglée pour maintenir la puissance de sortie du circuit amplificateur (203) à une valeur constante, est produite par le circuit intégrateur (217) en réponse à une comparaison entre le signal de puissance de sortie détecté (216) produit par le circuit détecteur (215) et le signal de commande de puissance de sortie (218) produit par le circuit processeur (219). Le rendement est augmenté en faisant varier dynamiquement le signal de tension de grille (213) jusqu'à sa valeur maximale de manière que le circuit amplificateur (203) puisse fonctionner aussi proche que possible de la saturation tout en maintenant constante la puissance de sortie.

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