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Feed-through configurations within high speed data transmission systems can cause serious electromagnetic interference (EMI) problems. A simple test method to measure the transfer impedance and shielding or screening attenuation of feed-through configurations and EMI - gaskets in well defined environments has been developed and tested with good results. Using the scattering parameters measured with...
In this paper general strategies for the characterization of a power delivery network are presented. A different approach is applied to measured or simulated S-parameters of a multiport system to generate an equivalent circuit network representation of the system of interest. The synthesized networks are compatible with Spice-based circuit simulators. The Spice netlist is usable in a general circuit...
In this paper, the RF exposure of the general public due to GSM, UMTS, and DVB-H is investigated. A methodology to execute field measurements of DVB-H signals is proposed. Measurements are performed at different locations in a DVB-H network in the city of Ghent, Belgium. Electromagnetic field strengths are compared to reference values and the increase of the cumulative electric field strength due...
This paper discusses the susceptibility of sigma-delta analog-to-digital converters to disturbances, arising from environmental electromagnetic pollution or from the parasitic coupling with noisy building blocks integrated in the same system-on-chip (SoC) or system-in-package (SiP). The operation of a first-order switched-capacitor sigma-delta converter, which receives at its input nominal signals...
Comprehensive physics-based via models are extended to consider traces connecting vias in PCB and package structures (stripline connection). The traces routed between two power planes are described by modal decomposition to account for the contribution of the parallel plate mode and the stripline mode. The analytical formulation for two vias connected by a trace is provided in this work. It results...
DC/DC Converters are now an essential part in a system due to the various needs of supply voltage that is necessary for different circuits in the system. However, there are many papers which have dealt for efficiency or for a novel structure that would be customized to the specific design, but few dealt with the noise characteristics of DC/DC converters which could critically affect to the output...
It is increasingly important to use Controlled Impedance for manufacturing High-Speed and high density-interconnect (HDI) printed circuit board (PCB). Furthermore, signal integrity (SI) tools are required to prevent and reduce most of impedance mismatch and crosstalk problems. This paper presents the impedance characterization of PCB traces, created in an industrial context. From the first specifications...
This paper deals with the experimental characterization of integrated circuit electromagnetic emissions. The influence of the IEC standardized board layout on the conducted emission of an integrated circuit has been analyzed by full-wave and circuital simulations. Guidelines for the design of such a test board which help to improve measurement repeatability are also provided.
In order to efficiently reduce EMI emissions, especially common mode (CM) conducted noise emissions that are the most disturbing in any adjustable-speed drive systems, behaviour understanding and propagation path knowing of parasitic currents in the system are indispensable. In this paper, a simple CM disturbances modelling is proposed to estimate or calculate the CM noise currents. The modelling...
A model to predict radiated emission from three-phase induction machines supplied by a voltage source inverter is proposed. Application of pulse-width-modulation (PWM) inverter source is analyzed, and a numerical example show the applicability of the approach in order to predict the radiated emission spectra.
The corona effect of HVDC transmission lines affects the electromagnetic environment significantly. A numerical method to calculate the ion flow field caused by corona effect in the vicinity of multi-circuit HVDC transmission lines is described. Deutsch assumption, a commonly used simplification in traditional numerical methods is eliminated. Skills of initial value estimation and boundary process...
The radiated emission from the power-line communications (PLC) is primarily caused by the common mode (CM) current converted from the differential mode (DM) current at the remote unbalanced elements (RUE) distributed on the power-line. The LCL measured at the outlet (outlet LCL) is often used as a measure of the unbalance despite the negative results. To resolve the issue, we have formulated the transmission...
In this paper, an efficient technique is developed to solve the inverse transform of exact closed form representations of frequency domain surface impedances, without pursuing tedious and complicated mathematical manipulations. This technique is based on the numerical inversion of the Laplace transform and has the advantages of simple programming, computational efficiency and easy error control. The...
Recently, the lightning strokes to transmission lines are been watched more carefully due to the needs to improve the transmission lines performance and the power quality. The TLM (Transmission-Line-Model) numerical technique is applied to model a distribution line, surge arresters, grounding electrodes impedance time varying, and the connecting leads to ground. Two simulations are shown and compared...
In this paper, we propose a complementary approach to full wave 3D numerical methods in order to evaluate external EM constraints on systems which can be assimilated to an assembly of cylinders. Here, we model the system under test as transmission line networks. The parameters of these transmission lines are adjusted in order to take into account the effect of cylinder thickness. Several examples...
The paper exhibits an array design for the source stirring technique in reverberation chambers. The development is pursued in two steps devoted to achieve a configuration of antennas that, fed by an electronic switching network, are able to provide the required statistics. In particular, the last step investigates the possibility to feed two antennas simultaneously.
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