By William G. Duff
This guide outlines the criteria that has to be thought of in designing circuits, apparatus, and platforms for electromagnetic compatibility (EMC). It teaches circuit and procedure designers the right way to thwart the ever-present perpetrator of electromagnetic interference (EMI). by way of emphasizing the basics, it offers info that would aid readers comprehend the reason that kinds the foundation for plenty of of the EMC practices and strategies. there's a lot information regarding those issues on hand in disparate varieties (journal articles, symposia complaints, etc.) yet this publication brings the severe wisdom right into a unmarried resource for fighting EMI. The objective of all equipment and process designs that needs to functionality in an electromagnetic setting (i.e. radio, television, radar, navigation, and communications) is to function with no adversely affecting different digital gear or structures. The inverse can be actual. The requirement for sharing spectrum has reached overseas degrees of outrage and it has to be handled in percentage to the protection and financial effect concerned. Designing digital structures for EMC outlines how.
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Extra resources for Designing Electronic Systems for EMC
Less than 10~5. 1 lists some approximate duty cycles identified to the nearest order of magnitude corresponding to a few transient sources. 5 for a computer clock, the emitting source is no longer regarded as a transient, although it may still have fast rise times and therefore broadband emissions. Transients have become a major problem because so many emitting sources are now operational and because computers, digital and control devices, among others, are especially susceptible. 1 Typical Transient Sources Emitting transient source Repetition rate Impulse width Duty cycle Fluorescent lamps 100 pps 10~ s 10~5 Ignition systems Idle speed Fast speed 100 pps 10 3 pps 10" 8 s 10~ 8 s 10~6 10~5 Relays and solenoids Casual use Pinball machine Teletype Brush-commutator motor 10" 3 pps lpps 10 pps 10 3 pps 10~ 7 s 10" 7 s 10~ 7 s 10" 8 s io-io On-off switches Wall switch Lathe Copy machine 10~4 pps 10" 3 pps 10~3 pps 10" 6 s 10~ 7 s 10~ 7 s io-io 7 io- 7 10~6 10~5 lo-io lo-io 20 BASIC TERMS AND DEFINITIONS The time and frequency domain representations for lightning, EMP, and ESD are illustrated in Fig.
Suggested Readings: EMI/EMC  Ott, Henry, Electromagnetic Compatibility Engineering, Hoboken, NJ: Wiley/IEEE Press, August 2009.  Paul, Clayton, Electromagnetic Compatibility for Engineers, with Applications to Digital Systems, and Electromagnetic Interference, Hoboken, NJ: Wiley/IEEE Press, September 2003.  Celozzi, Salvatore, Rodolfo Areneo, and Giampiero Lovat, Electromagnetic Shielding, Hoboken, NJ: Wiley/IEEE Press, April 2008. , Hoboken, NJ: Wiley/IEEE Press, March 2007. Chapter 2 Basic Terms and Definitions A number of specialized terms are applicable to the characterization, specification, and/or measurement of electromagnetic interference (EMI).
The characteristics of the power distribution in the vicinity of the fundamental are determined primarily by the baseband modulation characteristics of the transmitter. The resulting spectral components are termed modulation sidebands. The power distribution in the modulation sidebands is represented by a modulation envelope function. In general, the modulation envelopes are described by specifying bandwidths or frequency ranges and functional relationships which describe the variation of power with frequency, M(Af).
Designing Electronic Systems for EMC by William G. Duff