1,721,348 research outputs found
On 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
A transmission line simulator for EMC in complex electronic systems (EMCSIM)
No full textINTERNATIONAL JOURNAL OF NUMERICAL MODELLIN
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
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
Assessment of digital integrated circuit electromagnetic emission based on radiated power evaluation
No full textThis paper deals with the assessment of digital integrated
circuit (IC) electromagnetic emission (EME), and concentrates
on the specific aspect of EME of long external wiring,
driven by IC input-output pins. In particular, the contribution of
single IC pins is investigated by analyzing the structure composed
of an IC output driver connected via a microstrip line to a receiver.
A transmission-line model is used, and an approach based
on the concept of radiated power is applied to the characterization
of single-pin IC EME in terms of external–wiring radiation
effects. By the analysis of typical driver-wiring configurations, it is
shown that the spectrum of the driver output current is the quantity
of interest, and that the use of wiring with smaller characteristic
impedance leads to larger radiated power. The use of a specific
test setup (IEC 61967-4—150-
direct coupling method) for the experimental
assessment of single pin IC emissions is also considered.
Frequency-dependent setup effects are experimentally ascertained
via a scattering parameter characterization, and definition of suitable
circuit functions. An estimate of the degree of correlation between
voltage measurements foreseen by the test procedure and the
total power radiated by the loading network of an IC driver is derived
Amplitude errors in the Burg spectrum estimation of sinusoidal signals
No full textBurg MEM technique used to identify the parameters off sinusoids embedded in white noise suffers for peak-position and amplitude errors. In this paper, the existing technique that provides an estimate of the sinusoidal power from the spectrum level is tested for high SNRs. We demostrate both theoretically and via a computer simulation that the amplitude of the spectral peak is not a reliable parameter, even as an indication of signal power. A simple expression shows that the amplitude errors depend crucially on the initial phase of the signal, for a fixed data length and sampling rate
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