Patent ID: 6480011
Filing Date: 2002-11-12
Classification: G01R

Abstract:
A method of screening semiconductor integrated circuit devices, comprising the steps of:(a) supplying a specific power supply voltage to semiconductor integrated circuit devices to be tested while applying a specific test signal to the devices at a specific period; (b) observing power supply currents of the devices caused by the power supply voltage and the test signal; (c) generating sets of power spectrum data of the power supply currents of the devices corresponding to the test signal; (d) generating distributions of the sets of power spectrum data of the power supply currents; and (e) judging whether or not the distributions of the sets of power spectrum data of the power supply currents are equal to or greater than a specific reference value; wherein when the distribution of the set of power spectrum data of the power supply current of one of the devices is equal to or greater than the reference value, the device in question is regarded as a faulty one.