Low cross talk electrical connector system

• US 5,299,956 A
• Filed: 03/23/1992
• Issued: 04/05/1994
• Est. Priority Date: 03/23/1992
• Status: Expired due to Term

• Current Assignee: Optical Cable Corporation
• Original Assignee: Superior Modular Products Incorporated (Optical Cable Corporation)
• Inventors: Vaden, Sterling A., Brownell, Kenneth W.
• Primary Examiner(s): PIRLOT, DAVID
• Application Number:
  US07/855,893
• Time in Patent Office: 743 Days
• Field of Search: 439/492, 439/607-610, 439/620, 439/638-640, 439/651, 439/654, 439/655, 439/67, 439/77, 439/676, 379/332
• US Class Current: 439/638
• CPC Class Codes: H01R 13/6469 on substrates
• CPC Class Codes: H01R 24/64 for high frequency, e.g. RJ 45
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H05K 1/0228 Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors balanced signal pairs H05K1/0245
• CPC Class Codes: H05K 2201/09236 Parallel layout
• CPC Class Codes: H05K 2201/09245 Crossing layout
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

There is provided an apparatus for reducing pair to pair cross talk which arises in electrical connectors due to closely spaced elongated parallel contacts. The cross talk which occurs within the connector is reduced by modifying certain circuit paths either inside or outside of the connector so that each conductor of a first pair which is parallel to and cross talking with an adjacent conductor of a second pair in the connector is relocated adjacent and parallel to the other conductor of the second pair over a predetermined distance. It is preferred that the relocation of the circuit paths occur on a circuit board which is attached to the connector.

Claims

1. A low cross talk electrical signal transmission system comprising:

an electrical connection apparatus;

said electrical connection apparatus including an intermatable connector and a substrate;

said intermatable connector including a plug and a jack;

said jack attached to said substrate;

said intermatable connector and said substrate having at least first, second, third and fourth conductors;

said first and second conductors forming a first signal pair;

said third and fourth conductors forming a second signal pair;

said first and second conductors being adjacent to and parallel to one another through at least a major portion of said electrical intermatable connector;

said third conductor being adjacent to and parallel to said first conductor, and said fourth conductor being adjacent to and parallel to said second conductor through at least a portion of said intermatable connector thereby forming a first group of signal paths thus inducing cross talk from one signal pair to another signal pair in said intermatable connector when signals are applied to either of said signal pairs;

said third conductor being adjacent to and parallel to said second conductor and said fourth conductor being adjacent to and parallel to said first conductor for at least a portion of said substrate forming a second group of signal paths, thereby cancelling a substantial amount of said cross talk.

2. A system as set forth in claim 1 wherein said substrate is a circuit board.

3. A system as set forth in claim 1 wherein the length of said second group of circuit paths is substantially the same length as said first group of circuit paths.

4. A system as set forth in claim 1 wherein said connector apparatus includes a jumper including a second jack, a plug and a substrate connected between said second jack and said plug.

5. A system as set forth in claim 4 wherein said second substrate is a cable.

6. A system as set forth in claim 4 wherein said second substrate is received within an enclosure;

a second jack and a second plug are attached to said enclosure.

7. A low cross talk electrical signal transmission system comprising:

at least four conductive paths formed by a first pair of conductors and a second pair of conductors;

each pair of conductors being a part of a separate electrical circuit each conducting separate electrical signals;

an intermatable electrical connector including a plug and a jack;

first portions of each of said conductive paths being through said connector;

said conductive paths being substantially parallel to one another through at least a part of said connector thereby causing pair to pair signal interference when an electrical signal is on at least one of said pairs;

a substrate;

second portions of each of said conductive paths being on said substrate;

said substrate connected to said jack;

a capacitance located on said substrate for reducing the pair to pair signal interference, said capacitance formed by the arrangement of said second portions of said conductive paths on said substrate.

8. A system as set forth in claim 7 wherein said substrate is a circuit board.

9. A system as set forth in claim 7 wherein said substrate is a cable.

10. A system as set forth in claim 7 wherein each pair includes a first and a second conductor;

said first conductor of said first pair is adjacent to said second conductor in said second pair, and said second conductor of said first pair is adjacent to said first conductor in said second pair for the length of said conductive paths in said connector;

said capacitance formed by said first conductor of said first pair being adjacent to said first conductor of said second pair, and said second conductor of said first pair being adjacent to said second conductor of said second pair for a portion of the length of said conductive paths on said substrate.

11. A low cross talk electrical signal transmission system as set forth in claim 7 wherein said capacitance is said second portions of said conductive paths.

12. An electrical connector system comprising:

an intermatable connector having at least four parallel adjacent contacts;

two of said contacts being inner contacts and forming a first conductive pair;

two other contacts adjacent to said inner contacts on the outside thereof forming a second conductive pair;

said connector including a jack and a plug;

a carrier;

said jack connected to said carrier;

said carrier including at least four conductors;

each of said conductors connected to one of said contacts;

said first contact of said first pair connected to said first conductor of said first pair;

said second contact of said first pair connected to said second conductor of said second pair;

said first contact of said second pair adjacent to said first conductor of said second pair;

said second contact of said second pair connected to said second conductor of said second pair;

for a substantial portion of the length of said carrier said first conductor of said second pair being adjacent to said second conductor of said first pair, and said second conductor of said second pair being adjacent to said first conductor of said first pair whereby a substantial amount of pair to pair interference which is generated in said connector is cancelled on said carrier wherein said interference is substantially reduced in said system.

13. A system as set forth in claim 12 wherein said carrier is a circuit board.

14. A system as set forth in claim 12 further including a plug having at least four adjacent contacts and at least four parallel conduction;

the length of said conductors on said substantial portion of said carrier being substantially equal to the length of the contacts in said connector and said plug plus the length of said conductors in said plug.

15. A system as set forth in claim 12 wherein said carrier is a cable;

a jumper;

said cable forming a part of said jumper.

16. A system as set forth in claim 15 wherein said jumper includes a plug connected to said cable;

said plug having at least four contacts and at least four parallel conductors;

said plug adapted to be removably received in said connector.

17. A system as set forth in claim 16 wherein said jumper includes a second connector connected to said cable on the opposite end from said plug;

said second connector having at least four contacts.

18. A system as set forth in claim 17 wherein the length of said conductors on said substantial portion of said carrier being substantially equal to the sum of the length of the contacts in both of said connectors and the length of said conductors in both of said plugs.

19. A low cross talk electrical connector system comprising:

an intermatable electrical connector having at least two pairs of closely spaced electrical contacts thereby causing pair to pair cross talk when electrical signals are present on at least one of said pairs of said contacts;

said connector including a plug and a jack;

a carrier;

said carrier connected to said jack;

said carrier including at least four conductors;

each of said conductors connected to one of said contacts;

said conductors being physically oriented on said carrier for substantially reducing pair to pair cross talk originating in said connector.

20. A system as set forth in claim 19 wherein at least one of said conductors is crossed over at least another of said conductors.