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Based on the method of moments, the ground bounce on any arbitrary printed circuit structure as well as the common-mode current on any conductor that attached to the printed circuit structure is predicted. The method of moments is applied to obtain the impedance matrix, which can be used to determine the unknown current vector and the inductance ma...
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Context 1
... typical PCB structure is shown in Fig. 1. By assuming the conductor thickness is several orders smaller than the substrate thickness (which is generally true for a typical PCB); it can be modeled as a combination of 2D perfect electric conductor and 3D dielectric substrate. Under the influence of an incident electric field E i , a PCB causes a scattered electric field E s . ...
Context 2
... [16]. Fig. 10 shows the predicted CM current (Icm) on the 10 cm attached conductor. Generally, lower load impedance produces lower Icm. This is because Icm depends on the load voltage, and lower load impedance will produce lower load voltage. Hence, lower load impedance will result in lower Icm. The maximum radiated electric fields at 3 m from the ...
Context 3
... lower load impedance produces lower Icm. This is because Icm depends on the load voltage, and lower load impedance will produce lower load voltage. Hence, lower load impedance will result in lower Icm. The maximum radiated electric fields at 3 m from the microstrip line with attached conductor for various loads are predicted and plotted in Fig. 11. Increase in Emax is expected due to the additional CM radiation from the attached conductor. The level of increase varies with the load impedance. Under short-circuited load condition, the increase of Emax is very minimal, whereas Emax of open-circuited load increases significantly. Emax in Fig. 11 consists of both the DM radiation ...
Context 4
... for various loads are predicted and plotted in Fig. 11. Increase in Emax is expected due to the additional CM radiation from the attached conductor. The level of increase varies with the load impedance. Under short-circuited load condition, the increase of Emax is very minimal, whereas Emax of open-circuited load increases significantly. Emax in Fig. 11 consists of both the DM radiation from the microstrip line and the CM radiation from the attached conductor. To know the CM contributions in the overall radiation, the CM radiation from the attached conductor are ...
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Citations
Controlling electromagnetic emissions level of high-speed digital circuit has become utmost important to ensure a proper operation and performance of electronic devices as well as electromagnetic compatibility (EMC) compliance. The increasing clock frequency of the digital circuits has created more challenges to the circuit designers in producing a system that is complying with regulation since its harmonic frequencies can contribute significant amount of electromagnetic emission. The paper will highlight the most effective technique to ensure proper mitigation approach to achieve EMC requirement. The measurements were conducted in Gigahertz Transverse Electromagnetic (GTEM) cell. It is interesting to indicate that, different method of emission reduction is only effective at certain range of frequency.
