Tx line driver with common mode idle state and selectable...

H - Electricity – 04 – L

Patent

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Details

H04L 25/02 (2006.01) H03K 17/16 (2006.01) H03K 19/00 (2006.01) H04B 3/02 (2006.01) H04L 12/02 (2006.01)

Patent

CA 2536641

A transmit line driver with selectable slew rates and a common mode idle state comprises a capacitor array (186) of selectable capacitors coupled between a line driver (184) and a pre-driver (182) wherein a slew rate may be selected by the selectable capacitors. A common mode idle state is provided by coupling a selectable switch (214, 215) (MOSFET in the described embodiment) to a mirror device (198) that provides a bias current to the pre-driver wherein, when the bias current is removed by the switch, the pre-driver produces an output signal that is equal to the supply voltage for the circuit. Accordingly, a differential pair (202, 204) of the line driver are both biased on and provide a common mode idle state. The common mode idle state is equal to one half of an output signal magnitude for a logic one.

L'invention porte sur un circuit de commande de ligne de transmission à sélection des vitesses d'asservissement et ayant un état de repos en mode commun, ce circuit de commande de ligne comprenant une matrice de condensateurs sélectionnables montés entre un circuit de commande de ligne et un circuit de préparation de commande avec sélection d'une vitesse d'asservissement au moyen des condensateurs sélectionnables. Pour obtenir un état de repos en mode commun, on couple un commutateur sélectionnable (MOSFET en l'occurrence) à un dispositif miroir qui fournit un courant d'attaque au circuit de préparation de commande. Ainsi, lorsque le sélecteur supprime le courant d'attaque, le circuit de préparation délivre signal égal à la tension d'alimentation du circuit. On obtient ainsi une attaque différentielle sur une paire du circuit de commande de ligne, ce qui permet d'établir un état de repos en mode commun. L'état de repos en mode commun est égal à une moitié de la grandeur du signal de sortie pour un UN logique.

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