Circuit for producing low-voltage differential signals

Details Circuit for producing low-voltage differential signals Circuit for producing low-voltage differential signals

H - Electricity

03

K

H03K 19/0175 (2006.01) H03K 5/151 (2006.01) H03K 19/00 (2006.01) H03K 19/173 (2006.01) H04L 25/02 (2006.01)

Patent

CA 2419936

Described are systems for producing differential logic signals. These systems can be adapted for use with different loads by programming one or more programmable elements. One embodiment includes a series of driver stages, the outputs of which are connected to one another. The driver stages turn on successively to provide increasingly powerful differential amplification. This progressive increase in amplification produces a corresponding progressive decrease in output resistance, which reduces the noise associated with signal reflection. The systems can be incorporated into programmable IOBs to enable PLDs to provide differential output signals.

L'invention concerne des systèmes de production de signaux logiques différentiels. Ces systèmes peuvent être conçus avec différentes charges par programmation d'un ou de plusieurs éléments programmables. Dans un mode de réalisation, l'invention comprend une série d'étages d'excitation, les sorties desquels sont connectées les unes aux autres. Les étages d'excitation s'allument successivement afin de fournir une amplification différentielle de plus en plus puissante. Cette augmentation progressive de l'amplification produit une diminution progressive correspondante de la résistance de sortie, qui réduit le bruit associé à la réflexion du signal. Les systèmes peuvent s'intégrer à des IOB (blocs d'entrée et de sortie) programmables pour permettre à des PLD (circuits logiques programmables) de fournir des signaux de sortie différentiels.

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