201305.pdf 43279KB May 08 2013 11:07:04 PM

PATTERNSFAILURESSUSPECTED DEFECTTESSENTDIAGNOSISTESSENTYIELDINSIGHTDESIGNDATA MININGDRILL-DOWNCALIBRE DFM /PATTERN MATCHINGDFM RULE VIOLATIONBECOMES A PROPERTYOF THE DIAGNOSISSUSPECTDFM VIOLATIONSDFMRULESORDESIGNPATTERNSFigure 4 DFM analysis meets diagnosis-driven yield analysis in new methodologies and software tools such as these from MentorGraphics.Figure 5 DFY analysis places tremendous computational demands on the simulator.the core engine of a DFY solution. First,it needs to be built from the ground upwith specially designed data structuresand algorithms for statistical analysisand simulation. Second, the simulatorneeds to have tight integration intoa yield-prediction tool with the abilityto massively parallelize simulationson server farms. Third, the simulatorneeds to have full compatibility withfoundry model libraries and consistencywith the extraction process from siliconmeasurement.Given the tremendous computationaldemands of DFY analysis (Figure 5),the simulator needs to have high accuracy,capacity, and performance.Designers have had to choosebetween two types of circuit simulators.Either they can choose high accuracyand good usability available in SPICEsimulators, but sacrifice performanceand capacity, or designers can chooseFastSPICE with high performance andcapacity but with poor accuracy andusability. Neither is suitable as a DFYsimulation engine.34 EDN | MAY 2013 [ www.edn.com]