Next high frequency improvement by using frequency dependent effective capacitance
First Claim
Patent Images
1. An RJ-45 jack, comprising:
- a printed circuit board;
a plurality of input terminals that are electrically connected to the printed circuit board;
a plurality of output terminals that are electrically connected to the printed circuit board;
a plurality of differential pairs of conductive paths, wherein each conductive path electrically connects a respective one of the plurality of input terminals to a respective one of the plurality of output terminals; and
a first compensation structure that couples a first compensating crosstalk signal from a first of the conductive paths of a first differential pair of conductive paths to a first conductive path of a second differential pair of conductive paths; and
a second compensation structure on the printed circuit board that couples a second compensating crosstalk signal from a second of the conductive paths of the first differential pair of conductive paths to the first conductive path of the second differential pair of conductive paths,wherein a signal input onto the first of the conductive paths of the first differential pair of conductive paths from an RJ-45 style plug that mates with the RJ-45 style jack reaches the first compensation structure before the signal reaches the second compensation structure, andwherein the second compensation structure comprises a series combination of at least one spiral inductor and a first folded elongated interdigital capacitor,wherein the first folded elongated interdigital capacitor includes first and second generally parallel and spaced apart traces on a first layer of the printed circuit board and third and fourth generally parallel and spaced apart traces on a second layer of the printed circuit board,wherein the first and third traces are electrically connected to each other and the second and fourth traces are electrically connected to each other.
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Abstract
A connector is provided for simultaneously improving both the NEXT high frequency performance when low crosstalk plugs are used and the NEXT low frequency performance when high crosstalk plugs are used. The connector includes a first compensation structure provided on an inner metalized layer of the PCB at a first stage area of the PCB, and a second compensation structure, provided at a second stage area of the PCB, for increasing compensation capacitance with increasing frequency.
89 Citations
10 Claims
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1. An RJ-45 jack, comprising:
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a printed circuit board; a plurality of input terminals that are electrically connected to the printed circuit board; a plurality of output terminals that are electrically connected to the printed circuit board; a plurality of differential pairs of conductive paths, wherein each conductive path electrically connects a respective one of the plurality of input terminals to a respective one of the plurality of output terminals; and a first compensation structure that couples a first compensating crosstalk signal from a first of the conductive paths of a first differential pair of conductive paths to a first conductive path of a second differential pair of conductive paths; and a second compensation structure on the printed circuit board that couples a second compensating crosstalk signal from a second of the conductive paths of the first differential pair of conductive paths to the first conductive path of the second differential pair of conductive paths, wherein a signal input onto the first of the conductive paths of the first differential pair of conductive paths from an RJ-45 style plug that mates with the RJ-45 style jack reaches the first compensation structure before the signal reaches the second compensation structure, and wherein the second compensation structure comprises a series combination of at least one spiral inductor and a first folded elongated interdigital capacitor, wherein the first folded elongated interdigital capacitor includes first and second generally parallel and spaced apart traces on a first layer of the printed circuit board and third and fourth generally parallel and spaced apart traces on a second layer of the printed circuit board, wherein the first and third traces are electrically connected to each other and the second and fourth traces are electrically connected to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of providing compensation in an RJ-45 jack that has a plurality of input terminals, a plurality of output terminals, and a plurality of conductive paths that each electrically connects a respective one of the plurality of input terminals to a respective one of the plurality of output terminals and that are arranged as a plurality of differential pairs of conductive paths, the method comprising:
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passing one or more information signals through the RJ-45 jack on one or more respective ones of the plurality of differential pairs of conductive paths; coupling a first compensating crosstalk signal that has a first polarity from a first of the conductive paths of a first differential pair of conductive paths to a first conductive path of a second differential pair of conductive paths coupling a second compensating crosstalk signal from a second of the conductive paths of the first differential pair of conductive paths to the first conductive path of the second differential pair of conductive paths; wherein the second compensation signal is generated at least in part by a series combination of at least one spiral inductor and a first folded elongated interdigital capacitor, wherein the first folded elongated interdigital capacitor includes first and second generally parallel and spaced apart traces on a first layer of the printed circuit board and third and fourth generally parallel and spaced apart traces on a second layer of the printed circuit board, wherein the first and third traces are electrically connected to each other and the second and fourth traces are electrically connected to each other. - View Dependent Claims (10)
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Specification