Distributed noise reduction circuits in telecommunication system connector

• US 6,057,743 A
• Filed: 06/22/1998
• Issued: 05/02/2000
• Est. Priority Date: 06/22/1998
• Status: Expired due to Term

• Current Assignee: Hubbell, Inc.
• Original Assignee: Hubbell, Inc.
• Inventors: Aekins, Robert A.
• Primary Examiner(s): Abrams, Neil
• Assistant Examiner(s): HYEON, HAE M
• Application Number:
  US09/102,037
• Time in Patent Office: 680 Days
• Field of Search: 439/941, 439/55, 333/1, 333/12, 333/5, 379/417
• US Class Current: 333/1
• CPC Class Codes: H01R 13/6466 on substrates, e.g. printed circuit boards [PCB]
• CPC Class Codes: H01R 13/6467 by cross-over of signal conductors
• CPC Class Codes: H01R 13/6625 with capacitive component
• CPC Class Codes: H01R 13/6633 with inductive component, e.g. transformer
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• CPC Class Codes: H04B 3/34 by systematic interconnection of lengths of cable during laying; by addition of balancing components to cable during laying
• 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 1/162 incorporating printed capacitors
• CPC Class Codes: H05K 1/165 incorporating printed inductors
• CPC Class Codes: H05K 2201/09263 Meander
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

A connector for telecommunication systems has input terminals and output terminals arranged in ordered arrays and connected by a circuit having a plurality of conductive paths connecting the respective input and output terminals. The circuit cancels crosstalk induced across adjacent connected terminals by sets of sections. Two of the paths have one set of sections connected in series and spaced from each other between the input and output terminals. Another pair of paths have another set of sections connected in series and spaced from each other between the input and output terminals. Each section of the two sets forms a noise reduction circuit providing a reactive coupling between the respective paths which is greater than adjacent portions of the paths spacing the sections of the two sets.

Claims

1. A connector for communications systems, comprising:

first, second, third and fourth input terminals arranged in a first ordered array with said second and third input terminals being between said first and fourth input terminals;

first, second, third and fourth output terminals arranged in a second ordered array; and

a circuit electrically coupling said first, second, third and fourth input terminals to said first, second, third and fourth output terminals, respectively, and for canceling crosstalk induced across adjacent ones of said terminals, said circuit including first, second, third and fourth conductive paths between said first, second, third and fourth terminals, respectively, said first and third paths having a first set of sections connected in series and spaced from each other between said input terminals and said output terminals by a first set of adjacent portions of said first and third paths, said second and fourth paths having a second set of sections connected in series and spaced from each other between said input terminals and said output terminals by a second set of adjacent portions of said second and fourth paths, each section of said first and second sets forming a noise reduction circuit, each said noise reduction circuit providing a reactive coupling having a reactance between the respective conductive paths thereof, said reactance of each said noise reductive circuit being greater than reactances of the respective adjacent portions of said conductive paths spacing said sections of each of said sets.

2. A connector according to claim 1 wherein

said second and third paths cross each other between said input terminals and said sets of said sections.

3. A connector according to claim 1 wherein

said noise reduction circuits of each of said sets are cascaded from high compensation circuitry to low compensation circuitry in a direction from said input terminals to said output terminals.

4. A connector according to claim 1 wherein

each of said sets comprises first, second and third noise reduction circuits in order from said input terminals to said output terminals, said first noise reduction circuit of each said set compensating for approximately sixty percent of crosstalk therein, said second noise reduction circuit of each said set compensating for approximately thirty percent of crosstalk therein, said third noise reduction circuit of each said set compensating for approximately ten percent of crosstalk therein.

5. A connector according to claim 1 wherein

said first and fourth input terminals are respectively coupled to sources of equal and opposite signals.

6. A connector according to claim 5 wherein

said second and third input terminals are coupled to sources of equal and opposite signals.

7. A connector according to claim 1 wherein

said circuit comprises a printed wiring board with a dielectric substrate having conductors printed thereon.

8. A connector according to claim 7 wherein

said printed wiring board comprises a plurality of layers.

9. A connector according to claim 1 wherein

said sections of said conductive paths forming each of said reactive couplings are parallel.

10. A connector according to claim 1 wherein

said sections of said conductive paths forming each of said reactive couplings are parallel and coplanar.

11. A connector according to claim 1 wherein

said conductive paths are located on different planes.

12. A connector according to claim 1 wherein

said reactive couplings are capacitive couplings.

13. A connector according to claim 1 wherein

said reactive couplings are inductive couplings.

14. A connector for communications systems, comprising:

first, second, third and fourth input terminals arranged in a first ordered array;

first, second, third and fourth output terminals arranged in a second ordered array; and

a printed wiring board coupling said first, second, third and fourth input terminals to said first, second, third and fourth output terminals, respectively, said board including a dielectric substrate having first, second, third and fourth conductive paths printed thereon and extending between said first, second, third and fourth terminals, respectively, said first and third conductive paths having a first set of sections connected in series and spaced from each other on said substrate between said input terminals and said output terminals by a first set of adjacent portions of said first and third paths, said second and fourth paths having a second set of sections connected in series and spaced from each other on said substrate between said input terminals and said output terminals by a second set of adjacent portions of said second and fourth paths, each said section of said first and second sets forming a noise reduction circuit, each said noise reduction circuit providing a reactive coupling having a reactance between the respective conductive paths thereof, said reactance of each said noise reduction circuit being greater than reactances of the respective adjacent portions of said conductive paths spacing said sections of each of said sets;

said conductive paths having lengths and widths and being relatively spaced on said substrate, and said substrate having a dielectric constant such that any induced crosstalk is approximately cancelled.

15. A connector according to claim 14 wherein

said second and third paths cross each other between said input terminals and said sets of said sections.

16. A connector according to claim 14 wherein

said noise reduction circuit of each of said sets are cascaded from high compensation circuitry to low compensation circuitry in a direction from said input terminals to said output terminals.

17. A connector according to claim 14 wherein

each of said sets comprises first, second and third noise reduction circuits in order from said input terminals to said output terminals, said first noise reduction circuit of each said set compensating for approximately sixty percent of crosstalk therein, said second noise reduction circuit of each said set compensating for approximately thirty percent of crosstalk therein, said third noise reduction circuit of each said set compensating for approximately ten percent of crosstalk therein.

18. A connector according to claim 14 wherein

said first and fourth input terminals are respectively coupled to sources of equal and opposite signals.

19. A connector according to claim 18 wherein

said second and third input terminals are coupled to sources of equal and opposite signals.

20. A connector according to claim 14 wherein

said sections of said conductive paths forming each of said reactive couplings are parallel and coplanar.

21. A connector according to claim 14 wherein

said conductive paths are located on different planes.

22. A connector according to claim 14 wherein

said reactive couplings are capacitive couplings.

23. A connector according to claim 14 wherein

said reactive couplings are inductive couplings.