Description: Abstract— 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 to
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.
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