Time-Saving and Cost-Effective Innovations for EMI Reduction in Power Supplies
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Time-Saving and Cost-Effective Innovations for EMI Reduction in Power Supplies
EMI can no longer be an afterthought, given its potential to cause significant setbacks late in the design phase that cost both time and money. One of the most ubiquitous circuits in modern technology is the switch-mode power supply (SMPS), which provides drastic improvements in efficiency over linear regulators in most applications. But this efficiency comes at a price, as the switching of power metal-oxide-semiconductor field-effect transistors (MOSFETs) in the SMPS causes it to be a major source of EMI, which in turn can affect reliability. EMI primarily comes from discontinuous input currents, fast slew rates on switching nodes, and additional ringing along switching edges caused by parasitic inductances in the power loop.
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