By John R. Pierce
Книга just about all approximately Waves just about all approximately WavesКниги Физика Автор: John R. Pierce Год издания: 2006 Формат: djvu Издат.:Dover courses Страниц: 224 Размер: 1,1 ISBN: 0486453022 Язык: Английский0 (голосов: zero) Оценка:This textual content considers waves the good unifying thought of physics. With minimum arithmetic, it emphasizes the habit universal to phenomena reminiscent of earthquake waves, ocean waves, sound waves, and mechanical waves. subject matters contain speed, vector and complicated illustration, strength and momentum, coupled modes, polarization, diffraction, and radiation. 1974 variation.
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1a. At the VRM output, a large decoupling capacitor, indicated as bulk capacitance Cbulk , is inserted for filtering the lower-frequency components of low- and high-level changes caused by circuit switching throughout the PCB. For filtering the higher-frequency components, a number of decoupling capacitors with capacitance Cdec are distributed at regular intervals along the PDN and located near the devices. Between each pair of capacitors there is a power/ground effective inductance Lpcb . The problem with decoupling capacitors is that their action as capacitance is affected by the inductance associated with the component itself, plus the inductance associated with the component connections to the power and ground conductors, denoted by Lbulk and Ldec .
Therefore, the apertures and the contacts of the cable shield with the metallic part of the rack must be designed with care. The numerous peaks of emission measured without shielding are due to the harmonics of the clocks and are present in the whole frequency range. Lower, random, continuous levels of emission are caused by data signaling. To meet the limit, as required by FCC and CISPR, it is necessary to check whether all the peaks are under the required level using a peak detector. If some peaks are above the limit, the measurement must be repeated using a quasi-peak detector in order to verify whether the peak is persistent.
Reflections of signals have the effect of increasing the radiated emission from PCBs, while the switching noise produced by the digital devices generates strong radiations from cables attached to PCBs. 1 Definition of Radiated Emission Sources Radiated Emission (RE) regards the unwanted electromagnetic field produced by PCBs and cables of an equipment or system. Radiated emission is regulated by standards because the associated disturbance is considered as an external noise that can interfere with the environment 10 Signal Integrity and Radiated Emission of High-Speed Digital Systems or other nearby equipment or systems.
Almost All About Waves by John R. Pierce