By Michel Mardiguian
The third variation of Controlling Radiated Emissions by way of layout has been up-to-date to mirror the most recent adjustments within the box. New to this version is fabric on features of technical develop, particularly long-term strength potency, strength saving, RF toxins keep watch over, and so forth. This ebook keeps the step by step method 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 format, and the collection of a majority of these into low radiation packaging, together with I/O filtering, connectors and cables concerns. All guidance are supported through thorough and complete calculated examples. layout engineers, EMC experts and technicians will reap the benefits of studying concerning the improvement of extra effective and reasonable keep an eye on of emissions.
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Extra info for Controlling Radiated Emissions by Design
3 V. The characteristics of the I/O cable between the two metallic equipments are: 1. 2. 3. 4. 2 μH/m Terminating resistor ¼ 120 Ω Calculate the 45 MHz E field at 3 m vs. the FCC Class B limit for (a) both PCBs grounded to chassis and (b) one PCB 0 V ground floated, with a total stray capacitance of 30 pF. Solution • D ¼ 3 m > 48/45 MHz, so we are in far-field conditions. • ‘(m) and h(m) are <75/45 MHz, so we are below cable “antenna” resonance. We can use directly Equ. 20) or Fig. 6 curves for 3 m distance: Area ¼ 120 cm Â 30 cm ¼ 3, 600 cm2 ¼ 72 dB cm2 (a) For grounded condition, the cable is essentially an inductance; impedance is calculated from Equ.
IA j λ þ cos σ λ D2 2πD3 sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ πIA λ 2 λ 4 1À sin σ H σ A=m ¼ 2 þ 2πD 2πD λ D H r A=m ¼ Z 0 πIA Eϕ V=m ¼ 2 λ D sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ λ 2 1þ sin σ 2πD ð2:1Þ ð2:2Þ ð2:3Þ where: I ¼ loop current, in amperes A ¼ loop area in m2 λ ¼ wavelength in meters ¼ 300/F(MHz) D ¼ distance to observation point, in meters Z0 ¼ free space impedance ¼ 120π or 377 Ω Comparing this with Fig. 1, we see that for σ ¼ 0, Eø and Hø are null (sin σ ¼ 0), while Hr is maximum (cos σ ¼ 1).
Notice that we have passed the point where a floated PCB could be of any use. The exact calculation of Iaverage could be made using transmission line theory and would give slightly different results for each resonant condition. , CM ferrites, cable shield, balanced link) that we will examine later. 2 Open Wire, Monopole or Dipole We now examine the case where no geometric loop can be identified (Fig. 13). ) or into a plastic, ungrounded equipment. It may even not be terminated, waiting for a possible extension to be installed.