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Terminating differential transmission lines

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  • Riaz Sobrany
    A differential transmission line such as STP or Twinax has both a differential mode and a common mode characteristic impedance. The load at the receiving end
    Message 1 of 1 , Oct 16, 2003
      A differential transmission line such as STP or Twinax has both a
      differential mode and a common mode characteristic impedance. The load
      at the receiving end of the transmission line is normally made equal
      to the transmission line differential characteristic impedance in
      order to ensure maximum transfer of the differential mode signal to
      the load. The common mode signal also needs to be terminated as well
      by connecting a termination resistance equal to that of the
      transmission line common mode characteristic impedance to the
      receiving end of the line. How many different resistor configurations
      are there and what is the best one to use? I have encountered various
      configurations some using resistors to ground, some using the
      resistance of the load itself and some connecting to both a positive
      supply as well as ground.
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