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 variation is fabric on features of technical strengthen, in particular long-term strength potency, strength saving, RF pollutants keep watch over, and so on. This booklet 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 format, and the collection of a lot of these into low radiation packaging, together with I/O filtering, connectors and cables issues. All guidance are supported by way of thorough and accomplished 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 regulate of emissions.
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Additional info for Controlling Radiated Emissions by Design
If l, the largest dimension of the radiating element, is not small compared to distance D, another near-field condition exists due to the curvature of the wavefront. To have less than 1 dB (11%) error in the fields calculated by Equ. 7) and Equ. 8), another requirement stipulates that D > ‘2/2λ. However, if the dimension of the radiating element is less than λ/2, both length and distance far-field conditions are met for D (far field) >λ/2π. 013 IAF2 D 1/D 1/D3 1/D H= Al 3 4πD D= λ E H= 120π D 2π Fig.
19) that applies. 3. In the near field, for all circuits except low-impedance loops, E is independent of frequency and remains constant with V. At the extreme, if Zc becomes extremely large, current I becomes extremely small but ZW increases proportionally, keeping E constant when F decreases down to DC (more details in Appendix A “Modified dipole model”). 4. In the far field, radiation calculated for a two-wire circuit (the single-dipole formula times the weighing factor sin 2πs/λ due to the other wire carrying an opposite current) would reach exactly the same formula as the one for a radiating circular loop.
Because crosstalk and ground-impedance sharing are all derivative mechanisms, the pulse width of the coupled spike on the victim trace will be in the range of 3 ns. STTL transition time. This is a worst-case guess since pulse stretching and ringing will occur due to distributed parameters of the victim line. • If crosstalk exists, it will appear as a differential (signal-to-Gnd) noise at the I/O port. 5 Common-Mode Radiation from External Cables 39 Therefore a DM-to-CM reduction factor must be applied to the driven cable, like -10 dB for an ordinary unbalanced link (see previous Sect.