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By Michel Mardiguian

The third variation of Controlling Radiated Emissions by way 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 strengthen, in particular long-term strength potency, strength saving, RF toxins keep watch over, and so forth. This booklet keeps the step by step process 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 structure, and the collection of some of these into low radiation packaging, together with I/O filtering, connectors and cables issues. All directions are supported via thorough and complete calculated examples. layout engineers, EMC experts and technicians will take advantage of studying in regards to the improvement of extra effective and cost-efficient keep watch over of emissions.

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2. Check for Om ~ 48IFMHz (far-field conditions). 32 Controlling Radiated Emissions by Design I I Illmr 0=1 em 140 120 0=3e~" 100 I I I IIITlf 0= 10 em 80 i '" 1IIIIIm 60 0=30em al :g. 0 17 I I I Illnr 0=10m -40 1 kHz ~,; 0=3m -20 3 10 kHz 30 100 kH 300 1 MH2 .... / ..... ~ ,/ ..... 7 H Field from a 1 A, 1 cm2 loop. For other currents and areas, apply correction: 20 log (lamp x "=2). 3. If far-field, use the curves in Fig. 6 or Eq. 20). 4. 9 x Fx D). 5. Check if Icm > 'JJ4, or 5,0001F. If lis larger, replace Iby 5,0001F for entering area correction.

Its physical length exceeds 1J2-see Eq. 28]) to the point where 1J2 < D, we are back to the situation where, as the antenna electrically "shrinks," the only effective radiation comes from the 1J2 segment facing the observation point. At this juncture, there is no longer a difference-between the "infinite" wire and a smaller wire. They are both limited by the 1J2 clamp, and Eq. 28) would apply in either case. 3 Random versus Periodic Spectra The simplified equations briefl y described in Chapter 2 can be extrapolated to the majority of practical cases where the excitation signal is not a pure sinewave but a repetitive signal with a known period and waveform.

The low value would correspond to a typical MIL-STD-461 test setup, and the high value would be the extreme for a tabletop equipment in an FCC or CISPR test. A typical real-life value would be 300 n. 4 A 5 MHz clock is used on a short-haul parallel bus. For a 5 V pulse, the ninth harmonic, at 45 MHz, has an amplitude of OJ V. The characteristics of the I/O cable between the two metallic equipments are: I. 20 m 2. height, h = 0030 m 3. 2 J1H/m 4. 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.

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