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Next high frequency improvement by using frequency dependent effective capacitance

  • US 7,980,900 B2
  • Filed: 02/02/2010
  • Issued: 07/19/2011
  • Est. Priority Date: 05/14/2004
  • Status: Expired due to Fees
First Claim
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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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