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Neutron Induced Changes to Transistor Electrical Characteristics and the Changes to the Modified Ebers Moll Transistor Model.
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL AL GRO UND EQUIPMENT/MATERIALS DIRECTORATE
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The development of theoretical and empirical relations which predict the permament changes to the electrical characteristics of silicon transistors is described. Analytical techniques are also developed to obtain the parameters used in the Modified Ebers-Moll transistor model. The method used is to determine the effects on externally measurable characteristics and to relate these changes to the parameters in the Modified Ebers-Moll transistor model. Further, all nonlinear characteristics are related to the independent variables with interpolating polynomials and degraded characteristics presented. Then degraded characteristics are used to establish the parameters for and parameter changes to the transistor model used in the iterative NET-1 digital computer program. The result is a complete technique to predict the characteristics VBEsat, VBEforward, VCEsat, ICBO, and hFE as functions of neutron fluence to the Modified Ebers-Moll transistor model. For common emitter dc current gains down to approximately unity, a satisfactory nonlinear model exists for the neutron degraded characteristics found in silicon transistors. Typically, the gain characteristic is established to within 4 percent of the desired characteristic for the transistor model. Author
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