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Quiescent Current Testing of CMOS Data Converters: Design, Fabrication and Testing
Quiescent Current Testing of CMOS Data Converters Design Fabrication and Testing Author:SIVA YELLAMPALLI Power supply quiescent current (IDDQ) testing has been very effective in detecting physical defects such as open, short and bridging defects in VLSI circuits designed in CMOS processes. However, in sub-micron VLSI circuits, IDDQ current is masked by the increased subthreshold (leakage) current of MOSFETs affecting the efficiency of IDDQ te... more »sting. In this work, an attempt has been made to perform robust IDDQ testing in presence of increased leakage current by suitably modifying some of the test methods normally used in industry. In this book we have re-examined both IDDQ and Delta IDDQ methods of testing CMOS VLSI circuits and added features to minimize the influence of leakage current. We have designed built-in current sensors (BICS) for on-chip testing of analog and mixed-signal integrated circuits. We have also combined quiescent current testing with oscillation and transient current techniques to map large number of manufacturing defects on a chip.« less