Patent ID: 9575020
Date: 2017-02-21
CPC Classifications: G01N,G01R,H01L

Claim:
1. A heat generation point detection method for detecting a depth of a heat generation point in an integrated circuit, comprising steps of: supplying a first electric signal at a first frequency to the integrated circuit; acquiring a first detection signal indicative of a change of an amount of heat generation detected from the integrated circuit in response the first electric signal; supplying a second electric signal at a second frequency different from the first frequency, to the integrated circuit; acquiring a second detection signal indicative of a change of an amount of heat generation detected from the integrated circuit in response the second electric signal; acquiring a first phase shift between the first electric signal of the first frequency and the first detection signal and a second phase shift between the second electric signal of the second frequency and the second detection signal; acquiring depth information of the heat generation point on the basis of the first and second phase shifts; and a step of calculating a change rate of the phase shift between the electric signal and the detection signal against a variable calculated from the frequency of the periodic electric signal, based on the first and second phase shifts, and acquiring depth information of the heat generation point on the basis of the change rate.