Measuring method of characteristic impedance of the static electricity discharge protection network and the device which implements particular measurement.

摘要

PROBLEM TO BE SOLVED: To provide a method for speedily measuring the characteristic impedance of ESD protection circuits by applying a discharge voltage to the ESD protection circuits and provide a configuration of an apparatus capable of implementing the method.;SOLUTION: In the basic configuration of the present invention, changes with the passage of time in a discharge voltage applied to an electrostatic discharge protection circuit and changes with the passage of time in a discharge current flowing through the protection circuit are measured. The state of both the discharge voltage and the discharge current corresponding to each other and sequential rising to independently reach to a peak value and then to an attenuation process for every elapsed prescribed common time is grasped on the basis of input to a computer and output from the computer. In the case that a ratio between the amount of change of the discharge voltage and the amount of change of the discharge current in the attenuation process is approximately constant, the ratio is taken as an impedance value. On the basis of this, the characteristic impedance of the electrostatic discharge protection circuit is speedily measured in the method, and the apparatus implements the method.;COPYRIGHT: (C)2008,JPO&INPIT