Abstract
The control measures can be conceived at three levels—primary, secondary, and tertiary. Control at the primary level involves circuit design measures, such as decoupling, balanced configurations, bandwidth and speed limitation, and especially board layout and grounding. This chapter discusses layout and grounding. The most cost-effective approach is to consider the equipment's layout and ground regime at the beginning. No unit cost is added by a designed-in ground system. Ninety per cent of post-design electromagnetic compatibility (EMC) problems are due to inadequate layout or grounding. The important principles involved for well-designed layout and ground system are listed, which can offer both improved immunity and protection against emissions. The first design step is to partition the system. And then it should be ensured that the system is properly grounded. The chapter explores printed circuit board (PCB) layout. The way in which a PCB is designed makes a big difference to the overall EMC performance of the product, which incorporates it. This chapter outlines a few rules for PCB layout. These rules can at least partly form the basis for an in-house EMC design policy and design review checklist.
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