Dac based line driver with selectable pre-emphasis signal...

H - Electricity – 04 – L

Patent

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H04L 25/02 (2006.01)

Patent

CA 2536626

A Transmit line driver with selectable pre-emphasis and driver signal magnitudes comprises a primary current driver for setting a primary current level and a pre-emphasis current driver that provides an additional amount of current that is superimposed with or added to the primary current level produced by the primary current driver. The pre-emphasis current has either negative or positive magnitude based upon a pre-emphasis signal logic state. A first current selection module defines a reference signal that is used to select the primary current driver output signal magnitude in a first current mirror, while a second current selection module is used to define a second reference signal that selects a pre-emphasis current driver signal magnitude in a second current mirror. Logic generates a binary signal to both the first and second current selection modules to select the current levels as well as the pre-emphasis signal.

L'invention porte sur une commande de ligne de transmission, permettant de sélectionner l'amplitude d'un signal de préemphase et celle d'un signal de commande, comprenant une commande de courant primaire en fixant le niveau, et une commande de courant de préemphase fournissant une quantité additionnelle de courant se superposant ou s'additionnant au niveau du courant primaire produit par la commande de courant primaire. Le courant de préemphase présente une amplitude négative ou positive selon l'état de la logique du signal de préemphase. Le premier module de sélection de courant sert à définir un premier signal de référence sélectionnant l'amplitude du signal de commande du courant primaire d'un premier courant miroir, tandis que le deuxième module de sélection de courant sert à définir un deuxième signal de référence sélectionnant l'amplitude du signal de commande du courant de préemphase d'un deuxième courant miroir. La logique élabore un signal binaire à destination du premier et du deuxième module de sélection de courant pour sélectionner les niveaux de courant et du signal de préemphase.

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