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For the practical design of a common-mode filter (CMF), the substrate uncertainty and process deviations always result in the stopband offset of the CMF at high frequencies. To compensate the stopband offset, in this paper, a general method for expanding the bandwidth of a CMF is proposed. A three-conductor model is used to analyze the coupling characteristic between the CMF and the differential lines,...
At data rates beyond 10Gb/s, most wireline links employ NRZ signaling. Serial NRZ links as high as 56Gb/s and 60Gb/s have been reported [1]. Nevertheless, as the rate increases, the constraints imposed by the channel, package, and die become more severe and do not benefit from process scaling in the same fashion that circuit design does. Reflections from impedance discontinuities in the PCB and package...
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