Telecommunications Sensors

Download Designing Electronic Systems for EMC by William G. Duff PDF

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By William G. Duff

This guide outlines the criteria that has to be thought of in designing circuits, gear, and platforms for electromagnetic compatibility (EMC). It teaches circuit and method designers how you can thwart the ubiquitous wrongdoer of electromagnetic interference (EMI). through emphasizing the basics, it presents info that may support readers comprehend the reason that varieties the foundation for lots of of the EMC practices and strategies. there's a lot information regarding those themes to be had in disparate kinds (journal articles, symposia court cases, etc.) yet this ebook brings the severe wisdom right into a unmarried resource for scuffling with EMI. The target of all machine and approach designs that needs to functionality in an electromagnetic surroundings (i.e. radio, television, radar, navigation, and communications) is to function with out adversely affecting different digital gear or structures. The inverse is usually real. The requirement for sharing spectrum has reached overseas degrees of outrage and it needs to be handled in share to the protection and financial effect concerned. Designing digital structures for EMC outlines how.

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Example text

This chapter presents equipment EMC default data that have been derived from measured equipment characteristics, MILSTD-461 limits, and regulations. The procedure that is used for each transmitter output emission can be demonstrated by considering the interference situation that exists between a particular output of one of a number of potentially interfering transmitters and a victim receiver. 2) where, GxR(f, t, d, p) = the transmitting-source antenna gain in the direction of the receiver in dB 30 COMMUNICATION SYSTEMS EMC L(f, t, d, p) = the free-space propagation loss function in dB GRT(£ t, d, p) = the receiving antenna gain in the direction of the transmitter in dB By comparing the power available at the receiver input terminals to the power required to produce interference in the receiver at the frequency in question, PR(f, t), it is possible to determine the interference situation for the particular transmitter output being considered.

The potential for EMI problems resulting from pulse type signals will generally increase as • the pulse repetition rate increases, • the pulse width decreases, and/or • the rise time decreases. For this reason, special consideration must be given to pulse signals, such as computer clocks, with high repetition rates and short rise times. Also, short-duration transients (such as lightning, electromagnetic pulses, and electrostatic discharges) with short rise times can raise havoc in an electronic system.

7. 8. 9. 10. 11. 12. 5 The Intrasystem EMI problem. EMC DESIGN CONSIDERATION VS. SYSTEM LIFE CYCLE 9 coupling on power cables and/or signal cables, and radiated magnetic and electric-field coupling from box to box, cable to cable, box to cables, or cables to box. Intersystem EMI problems may result from signals that are coupled from the transmitting antenna of one system to the receiving antenna of another system. This intersystem EMI problem is particularly serious when many systems are required to simultaneously operate in a limited physical area such as a ship, an airplane, a vehicle, a building, a military base, an industrial site, a hospital, or a city.

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