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The total dose radiation response of radiation-resistant fullydepleted submicron n-MOS and PMOS transistors fabricated in SIMOX is presented. The total ionizing dose radiation induced threshold voltage shifts under three different irradiation bias conditions, including the worst case (pass-gate) bias for n-MOS transistors are discussed. Total dose hard fullydepleted p-MOS transistors are experimentally demonstrated. The larger threshold voltage shifts of fullydepleted n-MOS transistors as compared to partiallydepleted n-MOS transistors in an ionizing radiation environment are explained by a model coupling the radiation induced buried oxide charge to the top transistor.

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