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Controlling electromagnetic emissions level of high-speed digital circuit has become utmost important to ensure a proper operation and performance of electronic devices as well as electromagnetic compatibility (EMC) compliance. The increasing clock frequency of the digital circuits has created more challenges to the circuit designers in producing a system that is complying with regulation since its harmonic frequencies can contribute significant amount of electromagnetic emission. The paper will highlight the most effective technique to ensure proper mitigation approach to achieve EMC requirement. The measurements were conducted in Gigahertz Transverse Electromagnetic (GTEM) cell. It is interesting to indicate that, different method of emission reduction is only effective at certain range of frequency.