Electric circuit providing selectable short circuit for...

G - Physics – 01 – D

Patent

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Details

G01D 3/06 (2006.01) G01D 5/251 (2006.01) G01R 1/30 (2006.01) G01R 31/02 (2006.01)

Patent

CA 2453066

A LAN cable tester circuit (100) is disclosed having measurement end circuit components (30) and shorting end circuit components (132). The measurement end circuit components (30) are conventional and include a multiplexer (34) having a current source (36) and voltage sensing circuitry (38) electrically coupled thereto. The multiplexer (34) also has a plurality of pairs of associated electrical conductors (14, 16) included in the cable (12) under test coupled thereto. The shorting end circuit components (132) include another multiplexer (150) having the opposite ends of the electrical conductors coupled thereto, and further having a differential voltage amplifier (152) and two current output differential amplifiers (154) electrically coupled thereto. The shorting end circuit components (132) provide for an active short that eliminates the effect of the on-resistance attributable to semiconductor integrated circuit multiplexers.

La présente invention concerne un circuit d'essai de câbles de LAN (100) comprenant des composants de circuit d'étage de mesure (30) et des composants de circuit d'étage de court-circuit (132).Les composants de circuit de l'étage de mesure (30) sont les composants classiques et comprennent un multiplexeur (34) comportant une source de courant (36) et un circuit de détection de tension (38) qui lui est électriquement relié. Le multiplexeur (34) comprend également une pluralité de paires de conducteurs électriques associés (14, 16) inclus dans le câble (12) soumis à l'essai qui lui est couplé. Les composants de circuit de l'étage de court-circuit (132) comprennent un autre multiplexeur (150) auquel sont couplées les extrémités opposées des conducteurs électriques, et ils comprennent également un amplificateur différentiel de tension (152) et deux amplificateurs différentiels de sortie de courant (154) qui lui sont reliés électriquement. Les composants de circuit de l'étage de court-circuit (132) assurent un court-circuit actif qui élimine l'effet de la résistance à l'état passant attribuable aux multiplexeurs à circuits intégrés semiconducteurs.

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