Backplane having reduced lc product

H - Electricity – 05 – K

Patent

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H05K 1/14 (2006.01) H05K 1/02 (2006.01) H05K 7/14 (2006.01)

Patent

CA 2322151

A data processing system includes a backplane and a plurality of logic boards connected to the backplane by a plurality of connectors. A set of common points (23) is electrically coupled to the connectors by individual conductive traces between each common point and the corresponding pins of the connectors. The inductance of longer traces is reduced by merging traces near a central portion of the backplane to form a conductive region (23) that extends to at least one connector (34, 31) on either side of the common points, thereby electrically shortening the longer traces. The inductance is further reduced by widening the longer traces. Longer traces are wider than shorter traces to reduce the differences in the LC products associated with each trace and, therefore, the differences in delay among the traces.

On décrit un système de traitement de données qui comprend un panneau arrière auquel est raccordée une pluralité de composants LC au moyen d'une pluralité de connecteurs. Un ensemble de points de connexion communs (41) est relié électriquement aux connecteurs par des tracés individuels entre chaque point de connexion commun et les broches correspondantes des connecteurs. L'inductance des tracés les plus longs est réduite par fusion des tracés à proximité d'une partie centrale du panneau arrière pour former une zone conductrice (45) s'étendant jusqu'à au moins un connecteur (42, 43), de part et d'autre des points de connexion communs, ce qui réduit électriquement les tracés les plus longs. L'inductance est davantage réduite par agrandissement des tracés les plus longs, lesquels sont plus larges que les tracés les plus courts. On diminue ainsi les différences entre les composants LC associés à chaque tracé et, partant, les écarts de retard entre les tracés.

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