EMC at Component and PCB Level by Martin O 'Hara BSc (Hons) Applied Physics and Electronics

By Martin O 'Hara BSc (Hons) Applied Physics and Electronics MSc Physical Measurement Techniques and InstrumentationASEE Diploma in Engineering (DEM) with Honours(obtained 'Premium Award' for highest national examination mark)

This e-book presents the data and solid layout perform for the layout or attempt engineer to take the required measures to enhance EMC functionality and for this reason the opportunity of attaining compliance, early on within the layout process.

there are lots of merits for either the part provider and client, of EMC at part and PCB point. For the providers, not just will their items have the aggressive facet simply because they've got recognized EMC functionality, yet they are going to be ready should still EMC compliance develop into crucial sooner or later. For shoppers it's a particular virtue to grasp how an element will behave inside of a process with reference to EMC.

Shows how you can in attaining EMC compliance early on within the layout process
Provides the data to track procedure EMC functionality problems
Follows most sensible layout practices

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Additional info for EMC at Component and PCB Level

Example text

The power line could have transients from many sources, including other equipment connected to the same mains ring and even lightning-induced transients. The power line is one of the most useful places to place this type of component, it not only protects the equipment from incident transients, but suppresses transients from the system being conducted down the mains ring. At signal connector interfaces to the outside world, ESD is probably the most common EMC problem to be encountered. g. ). The cost of ESD protection can be reduced by protecting the contacts in a shielded connector with recessed pins and cabling with earthed screen.

Additional shielding can be added for primary and secondary local grounds with an intermediate safety or mains ground between them. 30 Transformer shield connection b) shield connected to Vcc Passive Components 39 can produce interwinding capacitance in the sub-pF range but adds to the expense of the transformer. In low frequency and power applications the wave shape is usually unaffected by shielding but in signal applications a reduction in rise time could result if shielding is applied to high frequency signals (the shield provides capacitive coupling to ground, hence acts as a low pass filter).

Passive low pass filters could be used, but the advantage of active devices over passive filters are the low capacitance these add to the signal line, therefore very low distortion or skew is added to the signal. 3 Transistors Transistors are traditionally classified as either bipolar or unipolar. The nomenclature describing the current carrier within the semiconductor, bipolar having both electrons and holes carrying current, unipolar having only one carrier particle. There has been a recent addition to the family of transistors that slightly clouds the simplicity of this; the insulated gate bipolar transistor.

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