Patent ID: 7283920

Claim:
An apparatus for testing a semiconductor device based on output data of said semiconductor device, comprising: a multi-strobe generator configured to generate a multi-strobe having a plurality of strobes, of which phases are different by a small amount; an output data transition point detector configured to detect a timing of rising or falling of a waveform of said output data based on said multi-strobe; a reference clock transition point detector configured to detect a timing of rising or falling of a reference clock outputted by said semiconductor device accompanying said output data, wherein said reference clock is a signal to set a timing of passing said output data, based on said multi-strobe; a judging unit configured to judge quality of said semiconductor device based on said timing of a timing of rising or falling of a waveform of said output data detected by said output data transition point detector and said timing of rising or falling of a waveform of said reference clock detected by said reference clock transition point detector; and a glitch detector configured to detect existence of a glitch in regard to said output data based on said timing of rising or falling of a waveform of said output data detected by said output data transition point detector.