SRAM-based FPGA devices are irradiated by 60Co γ rays at various dose rates to investigate total dose effects and the evaluation method. The dependences of typical electrical parameters such as static power current, peak - peak value, and delay time on total dose are discussed. The experiment results show that the static power current of the devices reduces rapidly at room temperature (25°C) and high temperature (80°C) annealing after irradiation. When the device is irradiated at a low dose rate, the delay time and peak - peak value change unobviously with an increase in the accumulated dose. In contrast, the function parameters completely fail at 2.1 kGy(Si) when the dose rate increases to 0.71 Gy(Si)/s.
Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China;Xinjiang Province Key Laboratory of Electronics Information Material and Device, Urumqi 830011, China;Graduate University, Chinese Academy of Sciences, Beijing 100049, China
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