Current mode interface for off-chip high speed communication

H - Electricity – 04 – L

Patent

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Details

H04L 25/02 (2006.01) H03K 19/0175 (2006.01) H04L 25/08 (2006.01)

Patent

CA 2601453

A transceiver interface for data transfer between two integrated circuits (ICs or "chips") utilizes a current mode technique rather than conventional voltage mode differential signaling techniques. A current pulse is injected into one of two transmission wires based on a signal value to be transmitted (e.g., logic "0" or "1") by a driver on a transmitting chip. The current pulse is received as a differential current signal at a receive block in a receiving chip. The differential current signal is converted to a low swing differential voltage signal by current comparators. The differential voltage signal may be detected by an op-amp receiver which outputs the appropriate signal value.

La présente invention concerne une interface d'émetteur-récepteur permettant un transfert de données entre deux circuits intégrés (IC ou <= puces >=), qui utilise une technique en mode courant plutôt que des techniques de signalisation différentielle en mode tension classiques. Une impulsion de courant est injectée dans un des deux fils de transmission, sur la base d'une valeur de signal à transmettre (par ex. logique <= 0 >= ou <= 1 >=), par un pilote, sur une puce de transmission. L'impulsion de courant est reçue comme un signal de courant différentiel au niveau d'un bloc de réception dans une puce de réception. Le signal de courant différentiel est converti en un signal de tension différentielle à faible excursion au moyen de comparateurs de courant. Le signal de tension différentielle peut être détecté par un récepteur d'amplificateur opérationnel qui produit la valeur de signal correcte.

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