1,721,035 research outputs found
Analysis of a test setup for the characterization of integrated circuit electromagnetic emissions
No full textThis paper deals with the characterization of integrated circuits (ICs) electromagnetic emission. In particular, a critical assessment of IEC 61967-4 measurement procedure is presented. The correlation between the measurements and the emission properties of ICs is investigated. Signal degradation effects introduced by the test setup have been experimentally evaluated by exploiting an ad hoc calibration test board. Beyond a quantitative characterization of the limits of the above-mentioned measurement technique, the results shown in this paper allow the identification a new and effective way to describe electromagnetic emission of output driver
EMC prediction model of a single wire transmission line crossing a circular aperture in a planar screen
No full textOn the equivalence between radiation and injection in BCI testing
Full text linkBulk current injection (BCI) and field coupling are analytically compared in order to ascertain if current injection tests are adequate for susceptibility assessment of electronic equipment. Transmission line theory is adopted for modelling wiring harnesses, and the equivalence is discussed by comparing the effects that the two kinds of excitation techniques produce at the line ends. General results are obtained, which are not affected by any assumptions on the equipment under test. It is shown that, from the theoretical point of view, injection by means of two current probes allows equivalence with any radiated plane wave excitation. The equivalence is achieved by controlling the clamp voltage in order to match the incident field characteristic
Susceptibility analysis of complex systems
Full text linkA study of electromagnetic coupling effects on systems containing distributed elements and lumped linear components is presented. The structure is decomposed into sections containing multiconductor transmission lines and interconnection blocks holding lumped elements. The external field is assumed to interfere with line sections, but mutual influences among different sections are neglected. Both the sections and the blocks are treated as multiport components and characterized by their scattering parameters. The analysis is based on a correspondence matrix that accounts for the topology of connections between sections and blocks. Closed-form solutions are derived in the Laplace domain, and the temporal evolution of voltages and currents at any of the system ports is obtained by a numerical inversion. This method makes it possible to predict the susceptibility of complex systems and to verify the intra-system compatibility (especially crosstalk). The relative influence of circuit components and of line layouts on the severity of interferences is evidenced by simulation result
Scattering analysis of signal degradation and interferences on long and lossy interconnects
Full text linkA time domain scattering formulation for low-loss nonlinearly loaded multiconductor transmission lines is presented. It is suitable for an efficient and accurate evaluation of crosstalk and field coupling. A simulation of the effects of interference on a long interconnect is give
Efficient computation of transient responses of frequency-dependent nonlinearly loaded transmission lines
Full text linkThe authors address the combined time and frequency domain analysis of nonlinearly loaded low-loss transmission lines. They show that a variety of interconnects are characterized by transfer functions, whose impulse responses have a fast initial-time structure and a slow long-time component. A piecewise linear approximation of the transient functions with nonuniform sampling is proposed as an effective method to obtain high accuracy with low computational cost
Alternative radiated susceptibility test methods at unit level
Full text linkThis article briefly illustrates and discusses the possibility to develop alternative, simplified test methods for radiated susceptibility testing at unit level for the aerospace sector. The rationale here discussed, and the alternative test methods here illustrated, are targeted to the development of a testing approach with deeper physics' sense, quicker and less expensive in order to help the industrial design process of equipment for spacecraft. The theoretical basis of this analysis is the possibility to enforce equivalence (in terms of common mode current) among the effects due to field-to-wire-coupling, bulk current injection and crosstalk, under suitable assumptions. Two dual approaches are considered, one aimed at achieving deterministic equivalence, the other enforcing equivalence in statistical terms. Pros and cons of the proposed alternative test methods are discussed by illustrating the outcomes of ad hoc setups and a wide experimental campaign
EMC analysis and prediction of complex electronic systems
No full textA methodology is presented to study the interaction of electromagnetic disturbances with complex systems represented as networks of transmission lines. The systems are separated into distributed and lumped parts: a clear distinction is made between circuits of discrete lumped, linear, passive or active components that represent loads or interconnection blocks, and connecting wires that are treated as multi-conductor transmission lines. The telegrapher's differential equations represent a widely accepted model for wire bundles, buses or lines of common use in electrical and electronic circuitry. Coupling with external interfering disturbances is rigorously evaluated, and equivalent distributed sources are introduced along the lines. Each subsystem is viewed as a multi-port component and is characterized in terms of a multi-port matrix. This is a natural choice for the distributed element sections and it is also well suited for lumped circuits. The key element of this formulation is the definition of a correspondance matrix that accounts for the topology of the connections between sections and blocks. The solution of the system equations describes the influence of a disturbance in virtually any section of the network. The potential of this method to display either the frequency or the time response at different places inside a complex system is assessed
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