Transient Analysis Of Telecommunication Cable Excited By External Field And Electrostatic Discharge Current Analyzed By Transmission Line Theory

The paper includes two parts. One is transient analysis of telecommunication cable excited by external field with transmission line theory; the other is electrostatic discharge current analyzed by transmission theory; at the same time, many factors which can impact on the ESD immunity performance of the device are investigated in the test and some suggestions are also given in this paper for improving its performance. The details are below:(1) The multi-conductor transmission line (MTL) theory is used to calculate the transient response occurring on a telecommunication cable excited by a plane wave field with a radio-frequency. Firstly, induced voltages on straight wire line are calculated by the finite-difference time domain (FDTD) method. Secondly, according to the results of induced voltages and currents, it is possible to replace the multi-conductor transmission line with an approximate single-wire line representation. Lastly, the effects on induced voltages on simplified single-wire line caused by cable length, electric parameters of the ground and terminated impedance are examined, the results are discussed.(2) The process of electrostatic discharge (ESD) is analyzed by transmission line theory and the ESD current which accords with the current prescribed in the IEC 61000-4-2 is simulated by the finite-difference time domain (FDTD) method, the key factors influencing the current parameters are analyzed. The result indicates that the lengths of the resistor and connection wire affect the rise time of the ESD current; the disposition of the connection wire influences the smooth of the current and the termination resistance affects the peak value of the current. All the presented results are valuable in designing ESD generator.(3) The following phenomena appear in the ESD immunity test of an electronic dictionary: reset; the LED is dark; black spots on the LED; data lost; and the dictionary is out of work. When much lower voltages are chosen instead, the dictionary still can't work properly. The paper is investigated those phenomena and some suggestions are given for improving its performance.