Patent ID: 6099161
Filing Date: 2000-08-08
Classification: G01R

Abstract:
A test method for use by automated test equipment which includes acomputer to measure the operation of an integrated circuit comprising of:providing a database to a computer, said database including at least patterns of vectors known to represent good components;assign randomly selected timing set to each vector;creating a pattern of test vectors with randomly assigned timing sets,establish a count representing the maximum number of times a set of test vectors will be applied to a device under test;presenting pattern of test vector to predeteremined ports of said integrated circuit;sensing voltage waveform on a particular port of said integrated circuit port;comparing said voltage waveform outputs of said stored patterns;if there is no match adjusting the periodT of timing sets within selected measured frequency range by a predetermined increment until the scanned patterns match the stored patterns; andif there is a match calculating the asynchronous frequency of said device under test.