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Electrostatic discharges (ESDs) due to the collision of charged metals cause serious malfunctions in high-tech information devices. In particular, the fast collision provides severe ESD events, while the mechanism has not fully been elucidated, though the approach speed is known to affect a spark length. In this study, to investigate this mechanism experimentally, we developed a setup for electronically...
This paper presents numerical modeling of electrostatic discharge (ESD) events with a FDTD-SPICE direct linking solver, which simultaneously solves a full-wave model for structures of analytical objects and SPICE equivalent circuit models including nonlinear lumped elements based on spark resistance formulae. This work focuses on treatment of transition from charging to discharging processes of an...
The ESD robustness of the electric device becomes weak year by year because of the high frequency operation. For that reason, the development of a countermeasure technology is necessary. Especially, the countermeasure technology in the system level is important for the next generation electric devices. In this paper, the discharge current and the radiated electromagnetic wave caused by ESD from ESD...
This paper describes an assessment of electrostatic discharge (ESD) events in terms of electromagnetic interference (EMI) assessments. To clarify the characteristics of high-speed ESD events, we used two kinds of discharge electrodes: sphere-and cylinder-shape ones. We measured the energy level of ESD waveforms with charging voltages of 0.25, 0.5, and 1.0 kV. We found that the cylindrical electrode...
Frequency spectra of transient electromagnetic wave caused by electrostatic discharge in spherical electrode were examined by experimental study. The experimental system consists of a pair of spherical electrodes with different diameters, a 1–18 GHz band width horn antenna and a 20 GHz bandwidth digitizing oscilloscope. Discharge voltage is less than 600 V in this experiment. Frequency spectra and...
This paper is to report that we have found the induced voltage on antenna by the transient EM field radiated from the small gap discharge is not always proportional to the applied voltage but higher when the gap width is smaller with even lower discharged voltage.
To understand the characteristics of human electrostatic discharges (ESDs), using a 12-GHz digital oscilloscope, we measured discharge currents injected into an IEC (International Electrotechnical Commission) current calibration target through the fingertip from a human body charged at a voltage of 300 V. Occurrence frequencies of the current waveforms and their cumulative relative frequency distributions...
We report on improvement of ESD characteristics of AlGaN/GaN high-electron mobility transistor (HEMT) using metal-insulator-metal (MIM) structure aluminium nitride (AlN) flip-chip (FC) submount. Compared with FC-free HEMT, measured results of the FC HEMT show the improvements of 25 and 150% under drain-to-source and gate-to-source electrostatic discharge (ESD) stress respectively, which is attributed...
AlGaN/GaN high electron mobility transistor (HEMT) was designed with improved surge protection characteristic through the use of a MSM-2DEG varactor connected in series to the gate of HEMT. Under an ESD surge stress of 1100 V or below, the HEMT incorporating this protection feature doesn't exhibit any change because the surge stress can be directly blocked by the MSM-2DEG varactor. Furthermore, flip-chip...
It is widely recognized that electrostatic discharge (ESD) generators cause electromagnetic (EM) noises even before and after ESD immunity testing specified in the International Electrotechnical Commission (IEC) standard. This may provide inconsistent test results, whereas its mechanism is not well understood. To explain the mechanism qualitatively, the authors investigated a generation modeling of...
In conformity with the IEC61000-4-2 standard, we conducted a case study of electrostatic discharge (ESD) tests for a small-type control board to investigate the basic coupling characteristics of induced noises by indirect ESDs. With a vertical coupling metal plane (VCP) and a horizontal coupling metal plane (HCP), the test was conducted under ±4kV and ± 8kV charging voltages. Pulse width modulation...
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