Multistage capacitive crosstalk compensation arrangement

• US 8,628,360 B2
• Filed: 01/22/2013
• Issued: 01/14/2014
• Est. Priority Date: 02/12/2008
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC GmbH (TE Connectivity Limited)
• Inventors: Murray, David Patrick, Hammond, Bernard Harold Jr.
• Primary Examiner(s): NASRI, JAVAID H
• Application Number:
  US13/746,386
• Publication Number:
  US 20130323973A1
• Time in Patent Office: 357 Days
• Field of Search: 439/676, 439/941, 439/620.21, 439/620.11, 439/76.1, 439/344, 439/387, 439/418, 439/408
• US Class Current: 439/676
• CPC Class Codes: H01R 13/6461 Means for preventing cross-talk
• CPC Class Codes: H01R 13/6464 by adding capacitive elements
• CPC Class Codes: H01R 13/6466 on substrates, e.g. printed circuit boards [PCB]
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• CPC Class Codes: H01R 13/6691 with built-in signalling means H01R13/717 takes precedence
• CPC Class Codes: H01R 24/64 for high frequency, e.g. RJ 45
• 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 2201/09236 Parallel layout
• CPC Class Codes: H05K 2201/09672 Superposed layout, i.e. in different planes
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: Y10S 439/941 Crosstalk suppression
• CPC Class Codes: Y10T 29/49204 Contact or terminal manufacturing
• CPC Class Codes: Y10T 29/49208 by assembling plural parts
• CPC Class Codes: Y10T 29/53209 Terminal or connector

Abstract

Methods and systems for providing crosstalk compensation in a jack are disclosed. According to one method, the crosstalk compensation is adapted to compensate for undesired crosstalk generated at a capacitive coupling located at a plug inserted within the jack. The method includes positioning a first capacitive coupling a first time delay away from the capacitive coupling of the plug, the first capacitive coupling having a greater magnitude and an opposite polarity as compared to the capacitive coupling of the plug. The method also includes positioning a second capacitive coupling at a second time delay from the first capacitive coupling, the second time delay corresponding to an average time delay that optimizes near end crosstalk. The second capacitive coupling has generally the same overall magnitude but an opposite polarity as compared to the first capacitive coupling, and includes two capacitive elements spaced at different time delays from the first capacitive coupling.

Claims

1. A crosstalk compensation system within a telecommunications jack, the system comprising:

a circuit board;

a plurality of contact spring vias disposed through the circuit board;

a plurality of wire termination contact vias disposed through the circuit board;

a plurality of tracks on the circuit board that connect the contact spring vias to the wire termination contact vias; and

a crosstalk compensation arrangement that provides crosstalk compensation between the tracks of the circuit board, the crosstalk compensation arrangement including a first plurality of capacitive plates arranged at a first layer of the circuit board and a second plurality of capacitive plates arranged at a second layer of the circuit board, the first and second layers being separated by a dielectric material, at least one of the capacitive plates of the second layer having a perimeter defining a recess that follows a contour of a respective one of the contact spring vias to provide a gap between the at least one capacitive plate and the respective one of the contact spring vias.

2. The crosstalk compensation system of claim 1, wherein the recess contours to provide a generally constant gap between the at least one capacitive plate and the respective one of the contact spring vias.

3. The crosstalk compensation system of claim 1, wherein the capacitive plates are generally rectangular.

4. A crosstalk compensation system within a telecommunications jack, the system comprising:

a circuit board;

a plurality of vias disposed through the circuit board;

a plurality of wire termination contacts and contact springs terminated in the vias;

a plurality of tracks on the circuit board that connect the contact springs to the wire termination contacts; and

a crosstalk compensation arrangement that provides crosstalk compensation between the tracks of the circuit board, the crosstalk compensation arrangement including a first capacitive plate arranged at a first layer of the circuit board and a second capacitive plate arranged at a second layer of the circuit board, the first and second capacitive plates being separated by a dielectric material and being positioned to oppose one another, the first capacitive plate being electrically isolated from a first of the vias and being electrically connected to a second of the vias, the second capacitive plate being electrically connected to the first of the vias and being electrically isolated from the second of the vias, the first capacitive plate having a perimeter defining a recess that follows a contour of the first via.

5. The crosstalk compensation system of claim 4, wherein the first and second vias support contact springs.

6. A crosstalk compensation system within a telecommunications jack, the system comprising:

a circuit board;

a plurality of vias disposed through the circuit board;

a plurality of wire termination contacts and contact springs terminated in the vias;

a plurality of tracks on the circuit board that connect the contact springs to the wire termination contacts; and

a crosstalk compensation arrangement that provides crosstalk compensation between the tracks of the circuit board, the crosstalk compensation arrangement including a plurality of capacitive plates that provide capacitive couplings between selected tracks of the circuit board, at least one of the capacitive plates being integral with a first one of the vias.

7. The crosstalk compensation system of claim 6, wherein the first via supports a contact spring.