Patent ID: 7081756

Claim:
A substrate inspection apparatus comprising: a first waveform measurer which acquires a first amplitude waveform that is the amplitude waveform of an AC voltage obtained from a semiconductor of a semiconductor substrate which is being inspected when an external AC power source is connected to said semiconductor and an AC voltage from said AC power source is applied to said semiconductor, the semiconductor substrate also having an interconnection that is supposed to be connected to said semiconductor; a second waveform measurer which is connectable to said interconnection of the semiconductor substrate and acquires a second amplitude waveform that is the amplitude waveform of a voltage in said interconnection when said AC voltage is applied to said semiconductor; and an evaluator which calculates a phase difference between said first amplitude waveform and said second amplitude waveform, outputs a resistance of the interconnection of the semiconductor substrate with the use of previously prepared data that expresses the relationship between said phase difference and the resistance of interconnection and extracts information on a defect of the semiconductor substrate by comparing the resistance of the interconnection with a threshold value.