Patent ID: 9588175
Date: 2017-03-07
CPC Classifications: G01N,G01R

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 light detector configured to detect reflected light that is reflected from the semiconductor device and output a detection signal; a frequency band setting unit configured to set a measurement frequency band and a reference frequency band with respect to the detection signal; a signal generating unit electrically coupling the frequency band setting unit and configured to generate a measurement signal from the detection signal in the measurement frequency band and generate a reference signal from the detection signal in the reference frequency band; and a signal acquisition unit electrically coupling the signal generating unit and configured to calculate a difference between the measurement signal and the reference signal to acquire an analysis signal, wherein, when a level of the detection signal is calculated based on power, the frequency band setting unit sets the reference frequency band to a frequency domain in which the level is lower than a level obtained by adding 3 decibels to a white noise level serving as a reference.