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92 DESIGN007 MAGAZINE I JANUARY 2022 EMI is another of those TLAs (three-letter acronyms) that the PCB industry is notorious for. You hear it all the time, referring to electro- magnetic interference. e devices we create are, in the context of this conversation, bun- dles of boards, chips, and cables that produce and are affected by EMI. When current flows through wires, traces, or circuits, some of the energy is propagated through the air in the form of electromagnetic radiation. is also takes place within a closed design—creating disturbance voltages throughout the conduc- tors in your device. ough most prevalent in devices with longer interconnects and at higher frequen- cies above 50MHz, nothing operates at 100% Everything You Wanted to Know About Electromagnetic Interference electromagnetic compatibility. is means every device is going to generate at least some amount of EMI. If enough EMI radiates from a device, it will interfere with the operation of other electronic systems operating in the vicinity. at's why they ask you to turn off your cellphones on air- planes and the reason grandpa made your dad turn off the radio in his room when it was time for Ed Sullivan on TV. Keeping an Eye on EMI ere are two main concerns with EMI that you need to consider. You should first deter- mine how much EMI your device is generat- ing and radiating to the environment. Dif- Connect the Dots by Matt Stevenson, SUNSTONE CIRCUITS

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