Patent ID: 9562944
Date: 2017-02-07
CPC Classifications: G01N,G01R,H01L

Claim:
1. A system for inspecting a semiconductor device serving as a device under test, the system comprising: a light source configured to generate light to be irradiated the semiconductor device; a tester configured to apply a test signal to the semiconductor device; a light detector configured to detect the light reflected by the semiconductor device and output a detection signal; a first spectrum analyzer, to which the detection signal is input, configured to measure first phase information serving as phase information of the detection signal; a reference signal generating unit electrically coupled to the tester and configured to generate a reference signal of a predetermined frequency; a second spectrum analyzer, to which the reference signal is input, configured to measure second phase information serving as phase information of the reference signal; and an analysis unit electrically coupled to the first spectrum analyzer and the second spectrum analyzer and configured to derive phase information of the detection signal at the predetermined frequency based on the first phase information and the second phase information, wherein the first spectrum analyzer measures the first phase information with respect to a frequency of a base signal that operates the first spectrum analyzer, the second spectrum analyzer measures the second phase information with respect to a frequency of a base signal that operates the second spectrum analyzer, and the frequency and the phase of the base signal of the first spectrum analyzer are synchronized with the frequency and the phase of the base signal of the second spectrum analyzer.