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双极线性稳压器电离辐射剂量率效应及其损伤分析
Degradation and dose rate effects of bipolar linear regulator on ionizing radiation
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摘要: 为了对双极线性稳压器在电离辐射环境下损伤变化特征及其剂量率效应进行研究,选择一组器件进行60Coγ高低剂量率的辐照和退火试验.结果表明线性稳压器的输出电压、最大负载电流、线性调整率、压降电压等多个关键参数都有不同程度的蜕变.且各器件在高低剂量率下的辐照响应略有不同,表现出不同的剂量率效应.文中通过多种形式的测试结果分析,系统地讨论了各参数变化的原因及其内部各模块对稳压器功能的影响.结合电离损伤退火特性,探讨了各剂量率效应形成的原因.这不但对工程应用考核提供了参考,而且为设计抗辐射加固器件提供了指导.Abstract: In order to investigate the dose rate effects and the radiation response of the voltage regulator, a group of bipolar linear regulators are irradiated by60Co γ at high and low dose rate. The results show that many of the parameters of the regulator, such as the max drive current, the output voltage, the line regulation and the dropout voltage, are sensitive to ionizing irradiation. Compared the radiation responses of the devices between high and low dose rate, the dose-rate effect is found to be dependent on device. The reasons for the degradation are discussed by combining the radiation response of the transistor and the amplifier with the circuit characteristic of the linear regulator. The dose rate effects are also analyzed from the annealing characteristics. So this is not only useful for their applicalion in space, but also helpful for the design of radiation hardness device.
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