Fields on the horizontal coupling plane excited by direct ESD and discharges to the vertical coupling plane
ABSTRACT Field levels in indirect electrostatic discharge (ESD) test setups are hardly known yet. It has been proposed to ANSI and IEC to use a horizontal simulator position instead of a vertical position in indirect ESD testing. This paper shows the field values on the horizontal coupling plane for different excitations and grounding topologies and questions if the goal of the change – a reduction of the simulator influence – will be achieved. Also, investigations dealing with the sensitivity of digital devices to impulsive fields are presented.
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ABSTRACT: If a PCB is struck by an ESD the injected current spreads throughout the PCB and returns via attached cables. During the current spread a variety of effects occur: The current spreads on the main ground and power planes, couples into traces and IC lead-frames and bond wires. Further, the PCB and the attached cables can form resonators causing ringing at their natural resonance frequencies. Understanding the current spread onto a PCB, best, also onto the traces is of great importance for gaining insight into ESD related problems on products. A test setup has been created that allows capturing and quantifying the spreading current. It is a mesh like structure above a ground plane. The current in each trace of the mesh can be measured via the magnetic field allowing to analyze the magnitude of the current for complete mesh or slotted mesh structures. Additionally, Current-probe was designed though the process of measuring the current waveform.
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ABSTRACT: The main goal of this paper is the analysis of the properties of the magnetic field wave properties according to distance from discharge point in order to obtain a quantification of electromagnetic pollution in surroundings of the studied equipment. The measurements are performed with the field probe in the vicinity of the ESD (electrostatic discharge) event, oriented parallel to the discharge plane to ensure maximum coupling, in order to assess the time domain measurement of magnetic field. The radiated magnetic field associated with the discharge can be determined from the discharge current or from the induced voltage in the field probe, based on Faraday's law. Magnetic field will be evaluated after multiple contact discharges in different points. The waveforms of magnetic fields are different depending on the ESD generator construction. In the paper we present the influence of two factors upon magnetic field wave above horizontal coupling plane: distance from discharge point and size of ground strap.Electrical and Power Engineering (EPE), 2012 International Conference and Exposition on; 01/2012
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ABSTRACT: This work aims to study the transient electric field radiating by two different generators of electrostatic discharges, which are constructed according to the Standard related to electrostatic discharges. Measurements of the electric field generated by contact electrostatic discharges a few centimetres away from the discharge point are presented. With the aberration to the Standard that the current transducer is mounted on an insulating material instead of a metal plate a closer simulation to real electrostatic discharges is obtained. Measurements proved that there are differences from generator to generator and also differences at the same generator, depending on its orientation.6th WSEAS Int. Conf. on Instrumentation, Measurement, Circuits and Systems; 04/2007