How is EMC achieved?
Most EMC is achieved through good circuit design. The EMI created by one part of a circuit is nullified by engineering another part of the circuit to make an opposing EMI, which when combined cancels the EMI out. Such engineering not only eliminates the creation of EMI, but it also makes the circuit resistant to external sources of EMI.
One of the most basic engineering techniques demonstrating this wave cancelling technique is twisted pair wiring, where one wire is run in opposite direction to another, and they are twisted together, so that the EMI produced by one wire is cancelled by the EMI produced by the other.
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