Download PDF by Sonia Ben Dhia, Mohamed Ramdani, Etienne Sicard: Electromagnetic compatibility of integrated circuits :

By Sonia Ben Dhia, Mohamed Ramdani, Etienne Sicard

ISBN-10: 0387266003

ISBN-13: 9780387266008

Electromagnetic Compatibility of built-in Circuits: concepts for Low Emission and Susceptibility focusesĀ on the electromagnetic compatibility of built-in circuits. the elemental recommendations, thought, and an in depth historic evaluate of built-in circuit emission and susceptibility are supplied. Standardized size tools are designated via numerous case stories. EMC versions for the middle, I/Os, offer community, and packaging are defined with functions to performed switching noise, sign integrity, near-field and radiated noise. Case reviews from diversified businesses and learn laboratories are offered with in-depth descriptions of the ICs, try set-ups, and comparisons among measurements and simulations. particular instructions for reaching low emission and susceptibility derived from the event of EMC specialists are provided.

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Additional resources for Electromagnetic compatibility of integrated circuits : techniques for low emission and susceptibility

Example text

L'hc mobile phones and WLAN systems in the frequency spectrum. The emission spectrum which is strongly correlated with the operating clock frequency, tends to be shifted toward higher frequencies. The 1C operating clock frequency, about 10 MHz for early 16-bit processors, is now approaching 1 GHz and is forecast to reach frequencies far beyond the GHz. The parasitic emission spectrum may interfere with several critical frequency bands such as FM radio, mobile phones or local wireless protocols like Bluetooth (Fig.

213). Robinson (1998) compared the radiated emissions produced by different families of logic circuits. An antenna was mounted 3 m away from the test board on an open-field test site. Results were provided for simple circuits such as inverters and NAND gates from various logic families: ACT (Advanced CMOS-TTL), FCT (Fast speed CMOS), HC (High speed CMOS), and HCT (High speed CMOS-TTL). Significant behavioral differences were observed, as illustrated in Fig. 2-14. The author claimed that the peak amplitude E in the measured spectrum could be approximated by the formula where: k=constant related to the integrated circuit design and technology A=supply amplitude (V) fmax=operating frequency (Hz).

Effective techniques involve on-chip decoupling capacitance, currentlimiting choke resistance, and supply network optimization. Such design techniques are described in chapter 7. Distributing decoupling capacitors close to main current sources (CPU, clock drivers, PLLs), in combination with current-limiting resistors in series on the supply lines have turned out to reduce the peak harmonics by 10-20 dB. Other techniques for reducing the parasitic emission concern the use of low-swing clock signals, or asynchronous design approaches.

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Electromagnetic compatibility of integrated circuits : techniques for low emission and susceptibility by Sonia Ben Dhia, Mohamed Ramdani, Etienne Sicard

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