Patent ID: 6469514
Filing Date: 2002-10-22
Classification: G01R

Abstract:
A timing calibration apparatus in an IC tester, said IC tester comprising:an IC socket on which an IC under test is to be mounted; signal paths including drivers respectively, each applying a calibration pulse to said IC socket; a probe to be sequentially contacted with terminals of said IC socket to take therein a calibration pulse applied to the IC socket; signal paths including comparating means respectively, each being connected with corresponding one of the terminals of the IC socket and being supplied through the IC socket with a calibration pulse having the reference phase generated from said probe; and timing calibration means for conforming a signal propagation time on each of said driver included signal paths to the reference value as well as conforming the applied timing of each of strobe pulses given to the comparating means to the predetermined reference phase of the calibration pulse, said timing calibration apparatus comprising: an optically driven type driver provided in said probe; and an optical drive signal supply means provided in said IC tester for supplying an optical drive signal to said optically driven type driver to generate the calibration pulse having the reference phase from the optically driven type driver.