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By Michel Mardiguian

The third version of Controlling Radiated Emissions by means of layout has been up-to-date to mirror the most recent alterations within the box. New to this version is fabric on points of technical boost, particularly long-term power potency, strength saving, RF pollutants regulate, and so forth. This publication keeps the step by step technique for incorporating EMC into each new layout, from the floor up. It describes the choice of quieter IC applied sciences, their implementation right into a noise-free published circuit format, and the collection of some of these into low radiation packaging, together with I/O filtering, connectors and cables issues. All instructions are supported through thorough and entire calculated examples. layout engineers, EMC experts and technicians will make the most of studying in regards to the improvement of extra effective and reasonably priced keep watch over of emissions.

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11) where, I = wire current, in Amperes 1= dipole length in meters A= wavelength in meter = 300IFMHz D = distance to observation point in meters Zo = free-space impedance = 120n or 377 Q As for the loop, we remark that for 0' = 0, E and H", are null (sin 0' = 0) while Er is maximum (cos 0' = 1). Eft in the axis of the wire, is of little interest because it drops off rapidly, as lID2, lID3. In the equatorial plane for 0' = n12, E and H have their maximum values. From now on we will consider this worst-case azimuth.

As for the loop, the terms with the higher exponent prevail, under the square root. 13) Here again, we remark that H, "annular" around the dipole is independent ofF. This formula holds down to DC, where it equals the well known result of the Biot and Savart law for a small element. This time, it is to H to fall off as lID2 while E falls as lID3. Both are strongly dependent on distance. 14) 24 Controlling Radiated Emissions by Design As for the loop, Zw near the source relates to the source impedance itself which, this time, becomes infinite when F gets down to DC.

4 V for a TIL noise margin), the system simply would not work. 3 A serial link between a computer and its peripheral operates at a 20 kb/s rate. Internally, the microprocessor uses a 20 MHz clock with Schottky logic. 3 V Therefore, we can make the following worst-case assumptions (see Fig. 3 V. • The pulse width of the coupled spike on the victim trace, because crosstalk and ground-inductance sharing are all derivative mechanisms, will be in the range of the STTL transition time of 3 ns. This is a worst-case assumption since pulse stretching and ringing will occur due to distributed parameters of the victim line.

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