Bi-directional balance low noise communication interface

• US 6,533,618 B1
• Filed: 04/02/2001
• Issued: 03/18/2003
• Est. Priority Date: 03/31/2000
• Status: Expired due to Fees

• Current Assignee: Ortronics Incorporated (Legrand SA)
• Original Assignee: Ortronics Incorporated (Legrand SA)
• Inventors: Aekins, Robert A.
• Primary Examiner(s): PATEL, TULSIDAS C
• Application Number:
  US09/825,471
• Time in Patent Office: 715 Days
• Field of Search: 439/676, 439/941
• US Class Current: 439/676
• CPC Class Codes: H01R 13/6466 on substrates, e.g. printed circuit boards [PCB]
• CPC Class Codes: H01R 13/6477 by variation of dielectric properties
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• CPC Class Codes: H01R 24/64 for high frequency, e.g. RJ 45
• CPC Class Codes: H01R 31/065 with built-in electric apparatus
• CPC Class Codes: H01R 4/2416 the contact members having insulation-cutting edges, e.g. of tuning fork type
• 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 2201/10189 Non-printed connector
• CPC Class Codes: Y10S 439/941 Crosstalk suppression

Abstract

The present invention relates to RJ45 modular inserts that are connected to a printed circuit board used to transfer high speed signals for telecommunication interface media connections. The printed circuit board is configured to reduce near-end cross-talk (“NEXT”) without compromising impedance. NEXT is substantially reduced by utilizing a low reactance dielectric insert with a two-stage combination positive and negative compensation removal technique. By utilizing this method, the pair-to-pair NEXT is substantially reduced and differential pair impedance are controlled in a simple and cost effective manner.

Claims

1. A device for reducing electrical noise during the transfer of data from media having a plurality of electrically conductive signal elements, wherein inductive coupling occurs in adjacent conductive signal elements, said device comprising:

(a) a dielectric support member having two opposing sides;

(b) a first data communication port disposed on the support member for interfacing with a first media;

(c) a second data communication port disposed on the support member for interfacing with a second media;

(d) a plurality of conductive members disposed on the support member for providing communication between the first and the second communication ports, wherein each conductive member of the plurality of conductive members is associated with only one signal element of the plurality of signal elements;

(e) at least one first plurality of conductive strips disposed on a side of the support member and in communication with a first conductive member of the plurality of conductive members;

(f) at least one second plurality of conductive strips disposed on a side of the support member and in communication with a second conductive member of the plurality of conductive members; and

wherein the first and the second pluralities of conductive strips have a positional relationship such that a capacitance for compensating inductive coupling is formed.

2. A device as in claim 1, wherein the first and the second conductive members are associated with adjacent signal members.

3. A device as in claim 1, further comprising:

(g) at least one third plurality of conductive strips in communication with a third conductive member of the plurality of conductive members;

(h) at least one fourth plurality of conductive strips in communication with a third conductive member of the plurality of conductive members; and

wherein the third and the fourth pluralities of conductive strips have a positional relationship such that a capacitance for compensating the potential inductive coupling is formed.

4. A device as in claim 3, wherein the first and the second pluralities of conductive strips compensate for positive inductive coupling and the third and the fourth pluralities of conductive strips compensate for negative inductive coupling.

5. A device as in claim 4, wherein the first and the second conductive strips are disposed on the support member within sufficient proximity whereby the first and the second conductive strips are transceivers with respect to each other, and

wherein the third and the fourth conductive strips are disposed on the support member within sufficient proximity whereby the third and the fourth conductive strips are transceivers with respect to each other.

6. A device as in claim 1, wherein the first data communication port is configured to interface with a standard RJ45 telecommunication plug.

7. A device as in claim 1, wherein the second data communication port is an insulation displacement contact terminal.

8. A device as in claim 1, wherein the first and the second conductive strips are disposed on the support member within sufficient proximity whereby the first and the second conductive strips are transceivers with respect to each other.

9. A device for removing electrical noise in standard RJ45 terminal plugs having four pairs of conductive signal elements one through eight wherein signal elements three through six are adjacent each other, comprising:

(a) a dielectric substrate;

(b) at least one data communication port disposed on the substrate for interfacing with an RJ45 telecommunication plug;

(c) at least one insulation displacement contact terminal disposed on the substrate for interfacing with twisted pair cable;

(d) at least one set of eight conductive traces on the substrate in communication with the communication port and the insulation displacement contact terminal, wherein one set of one through eight of the eight conductive traces are operatively associated with one through eight of the eight signal elements, respectively;

(e) a portion of the traces three through six each including a plurality of conductive strips having a positional relationship such that a balance voltage bridge of mutual capacitor reactance for compensating the electrical noise is formed.

10. A device as in claim 9, wherein said substrate is a printed circuit board.

11. A device as in claim 9, wherein said portion comprises a plurality of conductive strips in communication with the traces.

12. A device as in claim 9, wherein said portion comprises:

(e) a section of trace three being adjacent a section of trace five;

(f) a section of trace six being adjacent a section of trace five;

(g) a section of trace three being adjacent a section of trace four; and

(h) a section of trace six being adjacent a section of trace four.

13. A device as in claim 12, wherein the adjacent sections comprise a plurality of conductive strips.

14. A device as in claim 9, wherein the eight traces have substantially the same thickness.

15. A device as in claim 9, wherein the positional relationship of the traces with respect to each other is substantially the same for all the traces.

16. A printed circuit board assembly for removing electrical noise during the transfer of data from media having a plurality of electrically conductive signal elements, wherein inductive coupling occurs among pairs of adjacent signal elements of the plurality of signal elements, the printed circuit board assembly comprising,

(a) at least one first low reactance dielectric port disposed on the assembly for interfacing with the media;

(b) at least one second low reactance dielectric port disposed on the assembly for interfacing with the media;

(c) a plurality of conductive traces in communication with the first and the second ports, wherein each trace of the plurality of traces is associated with one signal element;

(d) at least one first compensation circuit including a plurality of conductive strips for at least one pair of the traces associated with the adjacent signal elements for providing opposite induced signal energy; and

(e) at least one second compensation circuit including a plurality of conductive strips for at least one pair of the traces associated with the pairs of adjacent signal elements for providing like induced signal energy.

17. An assembly as in claim 16, wherein the first compensation circuit provides positive voltage and the second compensation circuit provides negative voltage.

18. An assembly as in claim 16, wherein there are two first compensation circuits and one second compensation circuit.

19. An assembly as in claim 16, wherein the first port is configured to receive a RJ45 telecommunication plug.

20. An assembly as in claim 16, wherein the compensation circuits comprise a plurality of conductive strips in communication with the traces associated with the adjacent signal elements.

21. An assembly as in claim 20, wherein the plurality of conductive strips further comprise conductive tuning stubs.

22. A device for removing electrical noise during the transfer of data signals between media having a plurality of electrically conductive signal elements, the device comprising:

(a) a dielectric support member;

(b) a plurality of first and second communication ports, wherein each first and second communication port interfaces with one of the media;

(c) a plurality of conductive members providing communication between each first and second data communication port of the plurality of first and second communication ports, wherein each conductive member of the plurality of conductive members is associated with only one signal element of the plurality of electrically conductive signal elements;

(d) at least one first plurality of conductive strips in communication with a first conductive member of the plurality of conductive members;

(e) at least one second plurality of conductive strips in communication with a second conductive member of the plurality of conductive members; and

wherein the first and the second pluralities of conductive strips have a positional relationship such that a capacitance is formed for compensating the electrical noise.