Impedance compensation for a cable and connector
AssigneeNordx/CDT, Inc.
InventorsYves DeFlandre, Marc Hoffman, Gary Cyr
Life of this patent
Estimating the term…
Abstract
In an interconnection system including a cable and connectors, compensation is provided for stray reactances found in the connector elements. The connector elements may be RJ-style connector plug and jack pairs, which exhibit characteristic capacitive and inductive properties. The compensation is capacitive and/or inductive elements formed in the cable, components of the connectors, or an external printed wiring board. A double π-network is the preferred circuit topology for the compensated system.
Claims31
In an interconnect system including a communications cable of balanced pairs of conductors, a plug and a jack, wherein one or more of the cable, the plug and the jack include a stray reactance, apparatus comprising:
- a compensating reactance configured as π-network connected in one conductor of a first pair of conductors built into another one or more of the cable, the plug and the jack;
- wherein the compensating reactance corrects for both near end cross-talk and far end cross-talk.
In an interconnect system including a communications cable of balanced pairs of conductors, a plug and a jack, wherein one or more of the cable, the plug and the jack include a stray reactance, apparatus comprising:
- a compensating reactance built into another one or more of the cable, the plug and the jack;
- and
- a printed wiring board on which the jack is mounted, the printed wiring board including a first inductive printed wiring trace in one layer of the printed wiring board;
- wherein the compensating reactance further comprises π-network connected in one conductor of a first pair of conductors;
- and
- wherein the compensating reactance corrects for both near end cross-talk and far end cross-talk.
In an interconnect system including a communications cable of balanced pairs of conductors, a plug and a jack, wherein one or more of the cable, the plug and the jack include a stray reactance, apparatus comprising:
- a compensating reactance built into another one or more of the cable, the plug and the jack;
- wherein the apparatus includes balanced pairs of conductors a-b and c-d and the plug introduces a stray capacitance between conductors a and c having a value C and the jack introduces a stray mutual inductance between conductors a and c having a value L and the compensation reactance comprises:
- a capacitor having a value 2C connected from conductor b to conductor c;
- a mutual inductor having a value L linking conductors a and c with a polarity opposite that of the stray mutual inductance;
- and
- a capacitor having a value C connected from conductor a to conductor c.
In an interconnect system including a communications cable of balanced pairs of conductors, a plug and a jack, wherein one or more of the cable, the plug and the jack include a stray reactance, apparatus comprising:
- a compensating reactance built into another one or more of the cable, the plug and the jack;
- further comprising a multi layer lead frame structure whose signal conductors comprise compensating capacitive and inductive structures.
Dependencies are inferred from the claim text.