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PCB design for enhancing EMC of electronic systems

Posted: 29 Sep 2008     Print Version  Bookmark and Share

Keywords:PCB designers  electromagnetic compatibility  electronic equipment  noise immunity 

This application note is intended for hardware and/or PCB designers with a basic knowledge on PCB-design for improved electromagnetic compatibility (EMC). Basically the background of most design rules is explained but a detailed explanation would have overloaded the structure of an application note. There is plenty of literature on the market treating system design for EMC, shielding, cabling etc. Therefore these aspects of EMC are only little handled here. This application note targets on detailed aspects of PCB design in the vicinity of NEC MCU.

Today with increasing tendency most automotive, consumer and industrial applications include typically one or more microcontroller. Often several electronic modules build an application system and of course several applications and/or systems may be operating vicinal. Due to the increasing number of electronic applications their density in any given environment is increasing. Therefore, the environmental electromagnetic noise observed over long time at a given place rises. Functionality of electronic equipment will not be affected as long as at any given point in time its immunity is higher than the environmental electromagnetic noise. However, in modern systems, for example operating at higher frequencies but (due to lower power operation) having also lower switching thresholds, the noise immunity level is decreasing. It is essential for the electronic market to apply measures to improve the EMC of electronic systems.

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