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Employ fencing for best EMI protection

Posted: 01 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Faraday cage? picket fence? EMI suppression? PCB design and layout?

Electronic systems require careful design consideration due to a multitude of product constraints. The system must work flawlessly in hostile environments of thermal and electromagnetic energy in medical, industrial and automotive applications. Electronics failures can cause a safety concern due to device failure, incorrect readings, lockup and latchup. In non-redundant systems, the failure rates may be not acceptable and may need to be improved.

In these applications, sources of interference include noisy power lines, noise from motors and solenoids, and harness-induced noise. The typical solution to this problem is the use of EMI suppression devices such as ferrites and filters. This article focuses on the use of the Faraday cage or "picket fence" approach to PCB design and layout to eliminate costly EMI protection components.

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