Method and apparatus for automatic gain control and dc...

Details Method and apparatus for automatic gain control and dc... Method and apparatus for automatic gain control and dc...

H - Electricity

03

G

H03G 3/30 (2006.01) H03D 3/00 (2006.01) H03D 7/16 (2006.01)

Patent

CA 2163883

An automatic gain control (AGC) and D.C. offset correction method and apparatus for controlling signal power of a received RF signal within a dual mode quadrature receiver is disclosed herein. The AGC apparatus includes an adjustable gain amplifier (18). A quadrature downconverter (20) coupled to the amplifier (18) serves to translate the frequency of the output signal to a baseband frequency which is offset by a predetermined margin from D.C. Two high gain active lowpass filters (76 and 78) provide out-of-band signal rejection for the baseband signals. A D.C. feedthrough suppression loop supresses D.C. offsets produced by a downconverter (20) and the lowpass filters (76 and 78). The AGC apparatus also generates a received power signal based on the power of the output signal. A saturating integrator compares the received power signal to a reference signal and produces the gain control signal by integrating or by refraining from integration based on values of the reference, received power signal, and gain control signals.

L'invention concerne un procédé de commande de gain automatique (CGA)et de correction de décalage CC et un appareil permettant de commander la puissance de signal d'un signal radioélectrique reçu à l'intérieur d'un récepteur à quadrature bimode. L'appareil CGA comporte un amplificateur de gain réglable (18) auquel est couplé un adaptateur de gain à quadrature (20) qui traduit la fréquence du signal de sortie en une fréquence de la bande de base. Deux filtres passe-bas actifs à grand gain (76 et 78) assure l'atténuation du signal hors bande pour les signaux de la bande de base. Une boucle de suppression traversante CC supprime les décalages CC produits par un adaptateur de bande (20) et les filtres passe-bas (76 et 78). L'appareil CGA génère également un signal de puissance reçu en fonction de la puissance du signal de sortie. Un intégrateur saturant (22) compare le signal de puissance reçu à un signal de référence et produit le signal de commande de gain en intégrant ou en retenant à partir de l'intégration basée sur les valeurs de référence, le signal de puissance reçu et les signaux de commande de gain.

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