Common mode noise reduction in contactless differential bus

H - Electricity – 04 – L

Patent

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Details

H04L 25/02 (2006.01) H04L 25/08 (2006.01)

Patent

CA 2327271

A bus for high signal quality interconnections, comprising means for producing at least one common mode reflection, often for differential transmission line interconnections. Also, a bus for high signal quality interconnections further comprising means for under-damping the signal and/or reducing the common mode noise. In both cases the means are at least one impedance termination. To produce common mode reflections, there are non-contact couplers terminated by short and open circuits, which cause the reflections from via connectors and other like impedance discontinuities to be re-reflected in common mode so that they are rejected by a differential receiver. To produce under-damping of the signal and/or a reduction of the common mode noise, capacitive terminations are used. The under-damping of the signal sharpens in the falling edge of the coupler pulses.

La présente invention concerne un bus conçu pour autoriser des interconnexions à haute qualité du signal. Ce bus comporte un organe permettant de produire au moins une réflexion du mode commun, souvent pour des interconnexions de lignes de transmission différentielles. L'invention concerne également un bus pour interconnexions à haute qualité du signal comportant en outre un organe permettant de sous-amortir le signal et/ou de réduire le bruit du mode commun. Dans les deux cas, les organes considérés sont au moins un bouchon d'impédance. Pour obtenir les réflexions du mode commun, on utilise des coupleurs sans contact se terminant par des courts-circuits et des circuits ouverts, ce qui provoque une re-réflexion en mode commun des réflexions en provenance de connecteurs à traversées et autres discontinuités d'impédance de façon à faire rejeter de telles réflexions par un récepteur différentiel. Pour obtenir la sous-atténuation du signal et/ou la réduction du bruit du mode commun, on utilise des bouchons capacitifs. La sous-atténuation du signal s'aiguise dans le bord tombant des impulsions du coupleur.

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