Patent ID: 6225815
Filing Date: 2001-05-01
Classification: G01R

Abstract:
A charged particle beam test system for evaluating a semiconductor device under test (DUT), comprising:a charged particle beam column for irradiating a charged particle beam pulse upon a predetermined location of said DUT and detecting secondary electron emitted therefrom representing a voltage of the irradiated location of said DUT;an IC tester for supplying a test signal to said DUT to cause said voltage at said irradiation portion and generating a trigger signal with a predetermined timing relationship with said test signal, said IC tester comparing an output signal of said DUT with an expected signal and generating fail signals when output signal fails to match said expected signal at timings defined by comparator enable signals;a sampling pulse generator for generating a sampling pulse for driving said charged particle beam column at a predetermined time after said trigger pulse from said IC tester so that said secondary electron is emitted from said DUT in response to said sampling pulse;a fail signal separation circuit for identifying a fail signal from said IC tester which is generated at a specified timing; anda test result memory for storing measured data from said charged particle beam column representing an amount of said secondary electron emitted from said DUT when said fail signal is received from said fail signal separation circuit.