Electrical connector having time-delayed signal compensation
DCFirst Claim
1. An electrical connector for providing predetermined amounts of compensating signals to approximately cancel a like amount of an offending signal at a given frequency, the connector including first and second pairs of metallic conductors that are adjacent to each other and form an interconnection path between input and output terminals, the connector further including a first compensation stage that is positioned at a first effective location along the interconnection path, wherein compensating signals having a first magnitude and polarity are coupled between the pairs;
- a second compensation stage that is positioned at a second effective location along the interconnection path, wherein a compensating signal having a second magnitude and polarity is coupled between the pairs, wherein the first and second polarities are opposite to each other; and
said first and second effective locations being time delayed with respect to each other in order to provide predetermined phase shifts, at the given frequency, between the offending signal and each of the compensating signals.
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Abstract
An electrical connector 60 achieves improved transmission performance by introducing predetermined amounts of compensation between two pairs of conductors that extend from its input terminals to its output terminals along interconnection paths. Electrical signals on one pair of conductors are coupled onto the other pair of conductors in two or more compensation stages that are time delayed with respect to each other. Illustratively, the electrical connector is a modular jack that is adapted to receive a modular plug 20. Associated with the modular plug and the input of the modular jack there exists a known amount of offending crosstalk A0, which is approximately canceled by the two or more stages of compensating crosstalk. In a first stage, compensating crosstalk A1 is introduced between the pairs, and it has a first predetermined magnitude and phase at a given frequency. In a second stage, compensating crosstalk A2 is introduced between the pairs, and it has a second predetermined magnitude and phase at the given frequency. Multiple compensation stages are needed because, at high frequencies, compensating crosstalk cannot be introduced that is exactly 180 degrees out of phase with the offending crosstalk because of propagation delay. The electrical connector 60 is constructed using a multi-layer printed wiring board 600 having input and output terminals where connection to metallic wires is made. These terminals are interconnected on the printed wiring board by metallic paths that are arranged to provide multiple stages of compensating crosstalk. When the connector 60 is joined to a plug 20, the near-end crosstalk of the combined structure is extremely low at frequencies up to at least 200 MHz.
330 Citations
27 Claims
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1. An electrical connector for providing predetermined amounts of compensating signals to approximately cancel a like amount of an offending signal at a given frequency, the connector including first and second pairs of metallic conductors that are adjacent to each other and form an interconnection path between input and output terminals, the connector further including a first compensation stage that is positioned at a first effective location along the interconnection path, wherein compensating signals having a first magnitude and polarity are coupled between the pairs;
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a second compensation stage that is positioned at a second effective location along the interconnection path, wherein a compensating signal having a second magnitude and polarity is coupled between the pairs, wherein the first and second polarities are opposite to each other; and said first and second effective locations being time delayed with respect to each other in order to provide predetermined phase shifts, at the given frequency, between the offending signal and each of the compensating signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A communication jack assembly comprising:
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a wire board having conductive paths that extend between a jackwire terminal region on a first portion of the board and a wire-connection terminal region on a second portion of the board; a plurality of spring jackwires extending from the jackwire terminal region of the board, one end of the jackwires being connected to corresponding ones of the conductive paths; a dielectric terminal housing formed to protect the wire-connection terminal region on the top surface of the wire board; and a dielectric cover formed to protect the wire-connection terminal region at the bottom surface of the wire board; wherein said conductive paths include at least two effective locations where signal energy is coupled between the pairs of conductors to provide compensating crosstalk for canceling a known amount of offending crosstalk, which is present in the jackwire terminal region when electrical signals are present, said compensating crosstalk signals being time delayed with respect to each other and having predetermined magnitudes and phases that combine to approximately cancel the offending crosstalk at a given frequency. - View Dependent Claims (17)
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- 18. An electrical connector having at least two pairs of conductors that extend alone a metallic interconnection path between input and output terminals, said connector including at least three effective locations along the interconnection path where signal energy is coupled between the pairs of conductors, at one or more given frequencies the signal energy at each effective location has a predetermined magnitude and phase relative to the other effective locations such that near-end crosstalk is approximately canceled, wherein said one or more given frequencies is in the range 50-400 MHz.
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21. A low-crosstalk electrical connector system comprising a jack mounted on a printed wiring board at an input-terminal region of the board, offending crosstalk being present at the input-terminal region when electrical signals are present, said offending crosstalk comprising unwanted signal coupling between pairs of conductors at the input-terminal region having a known magnitude and phase at a given frequency;
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the printed wiring board including two pairs of metallic conductors that extend away from the jack along a signal-conducting path, which includes first and second stages where compensating crosstalk is coupled between the pairs of conductors for the purpose of canceling the offending crosstalk; the first stage providing compensating crosstalk between the pairs of conductors having a first magnitude and phase; the second stage providing compensating crosstalk between the pairs of conductors having a second magnitude and phase, wherein a vector sum of the offending and compensating crosstalk signals approximately cancel each other at the given frequency. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method for reducing a known amount of offending crosstalk at a given frequency, said crosstalk existing between first and second pairs of conductors at an input-terminal region of an electrical connector, the first pair being adjacent to the second pair, the method comprising the steps of:
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coupling a first amount of compensating crosstalk from the first pair of conductors onto the second pair of conductors, said first amount having a predetermined first magnitude and polarity at the given frequency; coupling a second amount of compensating crosstalk from the first pair of conductors onto the second pair of conductors, the second amount having a second predetermined magnitude and polarity at the given frequency, said first and second polarities being opposite to each other; and providing a predetermined time delay between the steps of coupling the first and second amounts of compensating crosstalk from the first pair of conductors onto the second pair of conductors.
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Specification