Control circuit for automatically controlled feed forward...

H - Electricity – 03 – G

Patent

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Details

H03G 1/00 (2006.01) H03F 1/32 (2006.01)

Patent

CA 2089617

A control circuit for an automatically controlled feed forward nonlinear distortion compensation amplifier. The control circuit controls a distortion detection loop and a distortion removal loop. The distortion detection loop is a loop for feeding forward input to a main amplifier into a first directional coupler. The distortion removal loop is a loop for feeding forward distortion elements into a second directional coupler. The main amplifier is preceded by a variable attenuator and a variable phase shifter. A variable attenuator and a variable phase shifter are also located in a feed forward path to the second directional coupler. The control circuit controls the variable attenuator and the variable phase shifter preceding the main amplifier for detecting the distortion elements. The control circuit controls the variable attenuator and the variable phase shifter located in the feed forward path to the second directional coupler for removing the distortion elements. A temperature compensation signal and an adjustment signal are added to a control signal by each adder provided at the output stage of the control circuit.

L'invention est un circuit de commande pour amplificateur à correction aval des distorsions non linéaires commandé automatiquement. Ce circuit commande une boucle de détection des distorsions et une boucle d'élimination des distorsions. La boucle de détection des distorsions transmet le signal d'entrée à l'amplificateur principal via un premier coupleur directionnel. La boucle d'élimination des distorsions transmet les distorsions à un second coupleur directionnel. L'amplificateur principal est précédé d'un atténuateur variable et d'un déphaseur variable. Un atténuateur variable et un déphaseur variable sont également montés dans un trajet de réaction aval allant au second coupleur directionnel. Le circuit de commande contrôle l'atténuateur variable et le déphaseur variable qui précèdent l'amplificateur principal pour détecter les distorsions. Il contrôle également l'atténuateur variable et le déphaseur variable qui se trouvent dans le trajet de réaction aval allant au second coupleur directionnel pour éliminer les distorsions. Un signal de correction des effets dus à la température et un signal d'ajustement sont ajoutés à un signal de commande par chaque additionneur de l'étage de sortie du circuit de commande.

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