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Ranganathan Gopinath
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Proceedings Papers
ISTFA2022, ISTFA 2022: Conference Proceedings from the 48th International Symposium for Testing and Failure Analysis, 110-114, October 30–November 3, 2022,
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Computer Aided Design (CAD) alignment is a key requirement for dynamic fault isolation. CAD alignment between the drawn layout and the physical reflected image from the device helps to navigate and observe the physical location of the suspected circuitry. Conventionally, large structures such as the boundaries of Static Random-Access Memory (SRAM) cells are used as reference for coarse CAD alignment and the shallow trench isolation (STI) layer is used for fine alignment while analyzing logic cell structures. With technology scaling, especially into FinFETs, the fine alignment has become more challenging as the reflected optical image of STI layer is poorly resolved. In this paper, we discuss the enhanced CAD alignment techniques in Synopsys Avalon that uses features “Minimum object size (dimension based)”, and “net search” developed in the CAD tool, Synopsys Avalon, combined with Amplitude lock-in Dynamic Photon Emission Microscopy (D-PEM) technique to assist a finer CAD alignment.
Proceedings Papers
ISTFA2019, ISTFA 2019: Conference Proceedings from the 45th International Symposium for Testing and Failure Analysis, 160-163, November 10–14, 2019,
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Dynamic Photon Emission Microscopy (D-PEM) is an established technique for isolating short and open failures, where photons emitted by transistors are collected by sensitive infra-red detectors while the device under test is electrically exercised with automated test equipment (ATE). Common tests, such as scan, use patterns that are generated through Automatic Test Pattern Generator (ATPG) in compressed mode. When these patterns are looped for D-PEM, it results in indeterministic states within cells during the load or unload sequences, making interpretation of emission challenging. Moreover, photons are emitted with lower probability and lesser energies for smaller technology nodes such as the FinFET. In this paper, we will discuss executing scan tests in manners that can be used to bring out emission which did not show up in conventional test loops.