Connector with counter-balanced crosswalk compensation scheme

• US 5,915,989 A
• Filed: 09/03/1997
• Issued: 06/29/1999
• Est. Priority Date: 05/19/1997
• Status: Expired due to Term

• Current Assignee: CommScope Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Hashim, Amid I., Moffitt, Bryan S., Ivan, William J., Adriaenssens, Luc W., Million, Troy P.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): NASRI, JAVAID H
• Application Number:
  US08/922,942
• Time in Patent Office: 664 Days
• Field of Search: 439/404, 439/941, 439/676
• US Class Current: 439/404
• CPC Class Codes: H01R 13/6464 by adding capacitive elements
• CPC Class Codes: H01R 13/6474 by variation of conductive properties, e.g. by dimension variations
• CPC Class Codes: H01R 4/2429 mounted in an insulating base
• 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 1/0231 Capacitors or dielectric substances
• CPC Class Codes: H05K 1/162 incorporating printed capacitors
• CPC Class Codes: H05K 2201/09245 Crossing layout alternating conductors H05K2201/097
• CPC Class Codes: H05K 2201/10189 Non-printed connector

Abstract

Connectors, such as 110-type patch plugs, are designed to reduce near-end crosstalk that is generated when the connector is mated to a corresponding receptacle, such as a 110-type connecting block. Connectors of the present invention employ a two-stage crosstalk compensation scheme in which a first stage induces a compensating crosstalk signal, having opposite polarity as the original crosstalk signal, while the second stage induces a counter-balancing crosstalk signal, having same polarity as the original crosstalk signal. The two-stage, counter-balanced crosstalk compensation scheme of the present invention takes into account both the magnitude of the original crosstalk signal as well as the phase differences between the original crosstalk signal and the compensating and counter-balancing crosstalk signals that result from the different locations along the signal path at which the crosstalk signals are induced. The contacts of the connector are designed such that the magnitudes and locations of the compensating and counter-balancing crosstalk signals provide effective crosstalk compensation over a particular range of frequencies, e.g., 1 MHz to 200 MHz.

Claims

1. A connector for cordage having two or more balanced signal-transmission pairs, comprising a pair of contacts for each balanced signal-transmission pair, wherein the contacts are configured to reduce an original crosstalk signal generated when the connector is mated to a receptacle, wherein each contact comprises a first set of structural components adapted to provide a first stage of crosstalk compensation and a second set of structural components adapted to provide a second stage of crosstalk compensation, wherein the first set of structural components generates a compensating crosstalk signal that opposes the original crosstalk signal and the second set of structural components generates a counter-balancing crosstalk signal that opposes the compensating crosstalk signal.

2. The connector of claim 1, wherein the first set of structural components is located between the receptacle and the second set of structural components to take into account phase differences between the original crosstalk signal, the compensating crosstalk signal, and the counter-balancing crosstalk signal.

3. The connector of claim 1, wherein the magnitude of the compensating crosstalk signal is approximately equal to the magnitude of the sum of the original crosstalk signal and the counterbalancing crosstalk signal.

4. The connector of claim 1, wherein the pair of contacts for each balanced signal-transmission pair are configured with one contact rotated 180 degrees about a longitudinal axis with respect to the other contact.

5. The connector of claim 1, wherein each contact has the same design.

6. The connector of claim 1, wherein the first and second sets of structural components provide compensation for reducing common-mode signals generated by unequal coupling.

7. The connector of claim 1, wherein the first set of structural components of each contact comprises:

(a) a main transmission path;

(b) a blade at one end of the main transmission path and adapted to engage a contact of the receptacle;

(c) an offset plate; and

(d) a bridge connecting the offset plate to the main transmission path; and

the second set of structural components of each contact comprises an insulation displacement contact (IDC) at another end of the main transmission path and adapted to terminate a wire of a balance signal-transmission pair.

8. The connector of claim 1, wherein the first stage generates both inductive and capacitive coupling between balanced signal-transmission pairs.

9. The connector of claim 1, wherein the connector is a 110-type patch plug and the receptacle is a 110-type connecting block with split-beam contacts.

10. The connector of claim 1, wherein the distance between the structural components of the second set for contacts corresponding to the same balanced signal-transmission pair is greater than the distance between the structural components of the second set for adjacent contacts corresponding to two different balanced signal-transmission pairs.

11. The connector of claim 7, wherein the position of the bridge is selected taking into account phase differences between the original crosstalk signal, the compensating crosstalk signal, and the counter-balancing crosstalk signal.

12. The connector of claim 7, wherein the sizes, shapes, and locations of the structural components of each contact are selected taking into account the magnitudes of the original crosstalk signal, the compensating crosstalk signal, and the counter-balancing crosstalk signal.

13. The connector of claim 7, wherein the main transmission paths and blades of the contacts form electro-magnetic loops for inductive coupling between balanced signal-transmission pairs and the structural components of the contacts operate as capacitor plates for capacitive coupling between balanced signal-transmission pairs.