Download Controlling Radiated Emissions by Design by Michel Mardiguian PDF

By Michel Mardiguian

The third variation of Controlling Radiated Emissions by means of layout has been up-to-date to mirror the newest adjustments within the box. New to this version is fabric on features of technical strengthen, particularly long-term power potency, strength saving, RF toxins keep watch over, and so on. This e-book keeps the step by step strategy 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 revealed circuit structure, and the collection of most of these into low radiation packaging, together with I/O filtering, connectors and cables issues. All guidance are supported through thorough and entire calculated examples. layout engineers, EMC experts and technicians will take advantage of studying concerning the improvement of extra effective and reasonably-priced keep an eye on of emissions.

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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. 1 Radiation Model for CM Currents into a Closed Ground Loop If the I/O cables are connecting to metallic equipment cases (and therefore, most likely, are grounded), the eM radiating loop is geometrically identified by its size Ix h (see Fig.

Terminating resistor = 120 n Calculate the 45 MHz E field at 3 m, against the FCC class B limit for (a) both PCBs grounded to chassis and (b) one PCB Ov floated, with a total stray capacitance of 30 pF. , so we are in far-field conditions. • 1m and hm < 75/45 MHz, so we are below cable resonance. We can then use directly Eq. 20) or the curves from Fig. 6 for 3 m distance: Area = 120 cm x 30 cm "" 3,600 cm2 = 72 dBcm 2 For a grounded condition (the cable is mostly an inductance), impedance is calculated from Eq.

3770 ...... / 1000 / J~, /' . 01 1/ Magnetic Loop 112ft 10 On.. 4 Wave Impedance vs. DistancelWavelength 5. Restrictions 3 and 4 seem alleviated if one switches to the loop model. The loop, indeed, is a more workable model for practical, non-radio applications because it does not carry the premise of a wire coming from nowhere and going nowhere. But it bears a serious constraint, too: the loop must be a short circuit, such as the wave impedance, and hence the E field is only dictated by the coefficients in Maxwell's equational solutions.

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