Reduction of Common-Mode and Differential-Mode Noises Using Timing-Offset Differential Signal

In this paper, the timing-offset differential signal is proposed to reduce the common-mode and differential-mode noises induced by the right-angled differential transmission line. The right-angled differential transmission line using the timing-offset differential signal can greatly reduce the time-domain transmission common-mode noise from 0.065 to 0.019 V and the time-domain reflection differential-mode noise from 0.033 to 0.023 V as compared with the right-angled differential transmission line using a zero offset time differential signal. Besides, the differential-to-common-mode conversion is reduced from −6.3 to −12.4 dB. Moreover, the differential-mode transmission is larger than −1.25 dB and the differential-mode reflections are smaller than −17 dB from dc to 6 GHz. In order to verify the simulation results, a real circuit is fabricated and measured where the measurement results are in good agreement with the simulation results.