Abstract
Here, a new analytical method, state matrix transform method, is proposed for calculating the descriptions of current waveforms generated by commercial electrostatic discharge (ESD) generators. This method can be used to analyse and design lumped parameter ESD circuits. A relatively simple eight elements ESD circuit model is established and used to predict the current waveform of human-metal ESD events. To calibrate the ESD simulator, a mathematical expression of four exponentials curve for ESD current waveform is given. This careful theoretical study of ESD current waveform calculation makes an innovative contribution to ESD generator circuit simulation and design, and it provides a new mathematical description for ESD sensitivity test.
Highlights
With the development of miniaturisation and modularisation of the integrated circuits, the sensitive electronic components or systems face a great threat from electrostatic discharge (ESD) current, and ESD has become a major concern in the microelectronic and electronic industry [1,2,3]
The International Electrotechnical Commission (IEC) 61000-4-2 standard [4] defines two kinds of discharge modes: contact discharge and air discharge, where the contact discharge mode is an idealised test method, but the air discharge mode is more closer to real events for establishing a common and reproducible basis for simulating the natural ESD phenomenon as well as possible
According to the anatomical structure model of human body, it is assumed that the ESD discharge circuit composed of the body and the earth is equivalent to a parallel path composed of a series of discharge resistance R0 and loop inductance L0 with a parasitic capacitor C0
Summary
With the development of miniaturisation and modularisation of the integrated circuits, the sensitive electronic components or systems face a great threat from electrostatic discharge (ESD) current, and ESD has become a major concern in the microelectronic and electronic industry [1,2,3]. Under the influence of environmental factors such as temperature, humidity, the charging voltage, metal approach speed, the topological structure of human body and ESD events, electrode types, and human body own inner electrical parameters [1, 8], ESD phenomenon has a poor repeatability [9] and may produce a fast electromagnetic pulses similar to travelling waves [10], accompanied by strong electromagnetic radiation. From this reason, the IEC 61000-4-2 standard [4] defines two kinds of discharge modes: contact discharge and air discharge, where the contact discharge mode is an idealised test method, but the air discharge mode is more closer to real events for establishing a common and reproducible basis for simulating the natural ESD phenomenon as well as possible.
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