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A novel common-mode noise cancellation technique for VDSL applications

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3 Author(s)
T. H. Yeap ; Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ont., Canada ; D. K. Fenton ; P. D. Lefebvre

Very-high-speed digital subscriber loop modems operate in frequency bands which coincide with many significant radio-frequency interference sources, particularly commercial AM radio. In these bands, the balance of most twisted-pair cables is low enough to allow substantial interference to transfer via the differential mode, disrupting the transmitted information signal. A novel wideband common-mode noise cancellation technique is presented. Simulation results show that the common-mode noise cancellation technique could provide 20- to 30 dB improvement in those radio frequency bands. Construction and testing of a hardware prototype are also presented. With finite-precision effects, measured test results show that common-mode noise cancellation in the order of 15-20 dB is achievable.

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:52 ,  Issue: 4 )