Common-Mode Suppression Design for Gigahertz Differential Signals Based on C-Slotline
نویسندگان
چکیده
For wideband common-mode noise suppression in high-speed differential signals, a low-cost compact filter is proposed and designed by etching two coupled C-slotlines on the ground plane. It is found that the bandwidth of the common-mode stopband over −10 dB is from 2.4GHz to 6.35GHz with no degradation of the differential-mode insertion loss and group delay within the wide common-mode stopband. In time domain, the differential signal eye diagram is not deteriorated as well. In addition, an equivalent circuit model is developed and provides a quickly prediction of the common-mode stopband. The results show a good consistency between the simulations and measurements.
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