Circuit de terminaison dynamique et programmable

Programmable dynamic line-termination circuit

Abstract

L'invention comporte un circuit de terminaison dynamique comprenant plusieurs éléments de terminaison parallèles (391-39n; 551-55n) qui réagissent successivement à une transition de signaux et qui sont sélectivement activés et désactivés de sorte que l'adaptation de l'impédance voulue à une ligne de transmission soit assurée. Chaque élément de terminaison comporte un premier trajet résistif dynamique entre une ligne d'alimentation en tension (Vdd) et la sortie (431-43n;651-65n) dudit élément de terminaison et un second trajet résistif dynamique entre la sortie de l'élément de terminaison et la terre, les deux trajets résistifs comportant des transistors à effet de champ (Mi1, Mi2 (i=1 à n)) dont les grilles de commande sont sensibles à un signal provenant de la ligne de transmission par l'intermédiaire d'une entrée (31; 51) du circuit. Pour les éléments successifs, une série de circuits à retard (412-41n;54i (i=1 à n)) est prévue entre l'entrée du circuit et les éléments de circuits de terminaison respectifs.
A dynamic termination circuit is disclosed that has a plurality n of parallel termination elements (391-39N; 551-55n) that respond successively to a signal transition and which are selectively enabled and disabled to provide a desired impedance match with a transmission line. Each termination element includes a first dynamic resistive path between a voltage supply line (Vdd) and that termination element's output (431-43n; 651-65n) and a second dynamic resistive path between the termination element output and ground, both resistive paths including field-effect transistors (Mi1, Mi2(i=1 to n)) whose control gates are responsive to a signal received from the transmission line via an input (31; 51) to the circuit. For successive elements a series of delay elements (412-41n; 54i (i=1 to n)) are provided between the circuit input and the respective termination circuit elements.

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NO-Patent Citations (1)

    Title
    See also references of EP 0972343A4

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