Method and apparatus for automatic gain control in a digital...

H - Electricity – 03 – G

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H03G 3/20 (2006.01) H04B 1/18 (2006.01) H04L 1/20 (2006.01)

Patent

CA 2188446

An automatic gain control (AGC) apparatus for a digital receiver is disclosed herein. The AGC apparatus includes an adjustable gain amplifier (18) having an input port for receiving an input signal, a control port for receiving a gain control signal, and an output port for providing an output signal. The AGC apparatus further includes a measurement circuit for generating a received power signal based on the power of the output signal. A saturating integrator (22) compares the received power signal to a reference signal and generates a gain control signal in response to a result of the comparison. The saturating integrator (22) includes a decision circuit (46) for enabling integration based on values of the received power signal, the reference signal, and the gain control signal. In a preferred implementation, the utilization of an input limiter in conjunction with an analog to digital converter enables accommodation of an increased input signal dynamic range.

L'invention concerne un appareil de commande automatique de gain (CAG) pour un récepteur numérique. Ledit appareil CAG comporte un amplificateur de gain réglable (18) comportant un port d'entrée destiné à recevoir un signal d'entrée, un port de commande destiné à recevoir un signal de commande de gain, et un port de sortie fournissant un signal de sortie. Cet appareil CAG comporte également un circuit de mesure générant 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 génère un signal de commande de gain en réponse à un résultat de la comparaison. L'intégrateur saturant (22) comprend un circuit de décision (46) permettant l'intégration en fonction des valeurs du signal de puissance reçu, du signal de référence, et du signal de commande de gain. Dans un mode de réalisation préféré, l'utilisation d'un limiteur d'entrée conjointement avec un convertisseur analogique-numérique permet la prise en charge d'une plage dynamique de signaux d'entrée plus grande.

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