Fault diagnostic improvement method for OTM-based testing
M.W.T. Wong, K.Y. Ko · 2002
This paper presents an effective combinational testing approach consisting of OTM (Oscillation-based Test Methodology), PSC (Power Supply Current), and NVM (Node Voltage Measurements) to detect and locate catastrophic faults for the threshold detector circuit. The approach comprises three separate phases. In phase-1, OTM is applied to the CUT under test mode. In phase-2, PSC measurements are used to distinguish those faults which would be detected by OTM but causing no oscillation. In phase-3, NVM is applied to further differentiate all those faults within the same equivalent fault set that would be partitioned and could not be distinguished in phase-2.