Patent ID: 6505312
Filing Date: 2003-01-07
Classification: G01R

Abstract:
An integrated circuit tester comprising:microstrip lines that connect to a plurality of contact points of the device under test and supply timing axis signals for testing; an electro-optic probe that is in proximity to said contact points, uses positions that are equidistant therefrom or a pre-set distance therefrom as skew measurement points, and detects the timing axis signals on each of said microstrip lines at said skew measurement points; a phase detection means that detects the phase of the timing axis signals that said electro-optic probe detects; a phase difference calculation means that finds the phase difference between the phase detected by said phase detection means and a pre-set reference value; and a phase control means carries out phase control of said timing axis signals supplied to said microstrip lines so that the phase differences obtained by said phase difference calculation means are cancelled.