不同<sup>60</sup>Co γ剂量率下10位双极D/A转换器的总剂量效应

不同⁶⁰Co γ剂量率下10位双极D/A转换器的总剂量效应

摘要: 为探索电离辐射对数模混合电路的影响，对国产10位双极D/A转换器在60Co γ射线不同剂量率辐照下的电离辐射效应及退火特性进行研究。结果表明：D/A转换器对辐照剂量率十分敏感，在大剂量率辐照时，电路功能正常，各功能参数变化较小;在低剂量率辐照下，各参数变化显著，电路功能出现异常，表现出明显的低剂量率损伤增强效应。最后，结合空间电荷模型对其电离辐射损伤机理进行了初步探讨。

Abstract: In order to find the responses of digital-to-analog (D/A) converters in ion-izing radiation environment, total dose effect and room-temperature annealing behavior of a 10-bit bipolar D/A converter irradiated by different 60Co γ dose rates were investigated. The D/A converter is quite sensitive to dose rates, and its functions are normal at high dose rate irradiation. While under low-dose-rate case, it works out of the way and many parameters go beyond its permitted range. Thus, it exhibits an enhanced low-dose-rate sensitivity effect. Finally, possible mechanism was discussed based on the space charge model.