By Michel Mardiguian
The third version of Controlling Radiated Emissions via layout has been up to date to mirror the newest adjustments within the box. New to this variation is fabric on features of technical strengthen, in particular long-term strength potency, strength saving, RF toxins regulate, and so forth. This publication keeps the step by step procedure 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 concerns. All guidance are supported by means of thorough and accomplished calculated examples. layout engineers, EMC experts and technicians will reap the benefits of studying in regards to the improvement of extra effective and low-budget keep an eye on of emissions.
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Additional info for Controlling Radiated Emissions by Design
6a E Field from a I cm2 loop, driven by I V, at 3 m. For other voltages and (I x S) values, apply correction: 20 log V + 20 log (I x S). Electric and Magnetic Fields from Simple Circuit Shapes I 110 100 i 90 r- 80 r-- I... 70 'E ...... 60 In ~ 50 Qj ~ 'tl ztt) 1i u: w ~ II I 1I VV I f-~ ZI= 110 F,~,i,1~0~ Z=30n~=3OrnA) 40 / 30 V 20 ~~ / l7 ~ ..... 6b E Field from a 1 cm2 1oop, driven by I V, at 1 m. For other voltages and (I x S) values, apply correction: 20 log V + 20 log (Ix S). possibility that the differential pair is simply a carrier of an EMI signal that has been generated in the vicinity and coupled to it through power supply conduction or nearby crosstalk.
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. 2 X 10-6 X 30x10-12 Therefore, due to resonance downshifting caused by the stray capacitance, the cable is now beyond resonance condition. We will use a typical characteristic impedance of 300 n. F= 1. Eo (I V, Icm2) from Fig. 6 45 MHz 2. 0 3. Area correction 4. 3 V) E=I+2+3+4= FCC limit (B) Off specification 10 dBllV/m 10 dBllV/m +72 -10 72 dBllV/m 40 dBllV/m 32 dB Notice that we have passed the point where a floated PCB could be of any use.
Rather, they have been picked up inside the equipment by crosstalk, circuit ground pollution or power supply DC bus pollution. Since the designer did not expect these harmonics, it is only during FCC, VDE, CISPR, MIL-STD-461 or other compliance testing that they are discovered. 10, we see a contrast between (a) what is normally expected (power line carries only 50/60 or 400 Hz currents, I/O cable carries a slow serial bus, and the 10 MHz clock is used only internally), and (b) what real life provides (I/O pairs or ribbon cable carry 10 MHz residues from the clock, picked up internally; their spectrum extends easily to 200 or 300 MHz).