Optimal Conditions for Boolean and Current Detection of Floating Gate Faults

  • Authors:
  • M. Renovell;A. Ivanov;Y. Bertrand;F. Azais;S. Rafiq

  • Affiliations:
  • -;-;-;-;-

  • Venue:
  • ITC '99 Proceedings of the 1999 IEEE International Test Conference
  • Year:
  • 1999

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Abstract

This paper studies the Boolean (Static Voltage) and theIddq (Static Current) detection of Floating Gate faults due to largeopens on transistor gate connections. We show that existingelectrical models describing the behavior of FGT faults fail toallow the prediction of the floating gate potential due to theunpredictable parameters such as the initial charges and thepolysilicon-to-bulk capacitance. We propose the twin-transistorstructure as a basis for a general analysis of the Boolean and Iddqdetection of FGT faults. Using this analysis, optimal conditions fordetection are defined for Boolean as well as Iddq tests.