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Electrical equipment and electronic products may generate electromagnetic radiation when operating. This may interfere with the normal operation of nearby equipment and may even affect human health. With technology advancement, decreasing Electromagnetic Interference (EMI) has become a major design challenge as modern electronic products have electronic circuits that are more integrated and complex than ever due to the need to operate at a faster speed. Hence, when choosing a well-designed electronic product, one should not only consider its desired functions but also whether it has a low EMI.