| Title |
Characteristics of the Voltage Waveforms Caused by Human Electrostatic Discharges |
| Authors |
Bok-Hee Lee ; Sung-Man Kang ; Ju-Hong Eom ; Tae-Ryong Lee |
| Abstract |
This paper describes characteristics of transient voltage waveforms caused by human electrostatic discharges(ESDs). For purpose of achieving the statistics on the meaningful amplitude and initial slope for transient ESD voltage waveforms, transient voltages due to human ESDs in various conditions were observed. A voltage measuring system with a wide bandwidth from DC to 400[MHz] was employed. ESD voltage waveforms are approximately the same as ESD current waveforms. Also the simulated results, which are calculated by the proposed equivalent circuit, are closely similar to the measured voltage waveforms. ESD voltage waveforms are strongly dependent on the approach speed and material of intruder, a fast approach causes ESD voltage waveform with a steep rise time than for a slow approach. The voltage waveforms from direct finger ESDs have a relatively long rise time of 10～30[㎱], but their peaks are low. On the other side ESD voltage waveforms caused by screwdriver with insulating handle have a steep slope with a very short, less than 1[㎱] rise time, but their initial spikes are extremely high. The obtained results in this work would be applied to solve ESD problems for low voltage and small current electronic devices. |