A Method of Current Testing for CMOS Digital and Mixed-Signal LSIs

Yukiya MIURA  Sachio NAITO  

IEICE TRANSACTIONS on Information and Systems   Vol.E78-D   No.7   pp.845-852
Publication Date: 1995/07/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Verification, Test and Diagnosis of VLSI Systems)
current testing (IDDQ testing),  built-in test,  design for testability,  digital and mixed-signal circuit testing,  

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Current testing has been proposed as an alternative technique for testing fully CMOS digital LSIs. Current testing has higher fault coverage than conventional stuck-at fault (SAF) testing and is more economical because it detects a wide range of faults and requires fewer test vectors than does SAF testing. We have proposed a current testing that measures the integral of the power supply current (IDD) during one clock period including the switching current. Since this method cannot be affected by the switching current, it can be used to test an LSI operating at a relatively high clock freuqnecy. This paper presents an improved current testing method for CMOS digital and analog LSIs. The method uses two current values (i.e., an upper limit and a lower limit) and judges the circuit under test to be faulty if the measured IDD is outside these limits. The proposed current testing is evaluated here for some kinds of faults (e.g., the bridging fault and the breaking fault) in digital and mixed-signal LSIs, and its efficiency of the current testing using SPICE3.