Output buffer with independently controllable current mirror...

H - Electricity – 03 – K

Patent

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Details

H03K 19/0185 (2006.01) H03F 3/72 (2006.01) H03G 1/00 (2006.01)

Patent

CA 2372183

A programmable output buffer with independently controllable current mirror legs is disclosed. The output buffer includes a current mirror (104) that has a reference leg (120, 132, 134) and a number of current mirror legs (106a, 106b, 106c). The reference leg is biased using a reference current (126) that is relatively independent of the supply voltage (VDD). Each of the current mirror legs is coupled to the output terminal of the output buffer, and conducts a current that is proportional to the reference current. This produces an output current that is relatively independent of variations in the supply voltage. To provide a programmable output power level, each of the current mirror legs are separately enabled (CNTRL). By controlling which of the current mirror legs are enabled, the output power of the output buffer can be controlled.

L'invention concerne un tampon de sortie programmable pourvu de branches de miroir de courant pouvant être commandées indépendamment. Le tampon de sortie comprend un miroir de courant comportant une branche de référence et une pluralité de branches de miroir de courant. La branche de référence est polarisée au moyen d'un courant de référence qui est relativement indépendant de la tension d'alimentation. Chacune des branches de miroir de courant est couplée à la borne de sortie du tampon de sortie et conduit un courant qui est proportionnel au courant de référence. Cela produit un courant de sortie qui est relativement indépendant des variations de la tension d'alimentation. Pour que l'on puisse obtenir un niveau de courant de sortie programmable, chacune des branches de miroir de courant peut être activée séparément. La puissance de sortie du tampon de sortie peut être commandée par commande des branches du miroir de courant activées.

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