线性稳压器不同偏置下电离总剂量及剂量率效应

Total Dose and Dose Rate Effects of Linear Voltage Regulator With Different Biases

为对工作在空间电离环境中稳压器的电离总剂量及剂量率效应进行研究,选择一种常用的低压差线性稳压器进行了不同偏置的高低剂量率的电离辐照和退火实验。结合电路特征和电离辐射效应,对线性稳压器产生蜕变的原因进行分析。结果显示,器件输出电压、线性调整率、负载调整率等关键参数在电离辐射环境下发生不同程度变化。在零偏条件下,低剂量率(LDR)下损伤明显大于高剂量率(HDR)条件,表现出低剂量率损伤增强效应;而在工作偏置条件下,高剂量率辐照损伤大于低剂量率的,退火实验中,发生损伤恢复现象,表现为时间相关效应。在整个辐照和退火过程中,零偏置损伤比工作偏置损伤大。

In order to investigate the total dose and dose rate effects of voltage regulator, a bipolar linear regulator was irradiate by 60Co γ with different dose rates and biases. And anneal experiment was done to distinguish the dose rate effect. The reason for the degradation of the regulator was discussed through analyzing the radiation effect and the circuit character. Many key electrical parameters of the regulator, such as the output voltage, the line regulation and the load regulation, are sensitive to total ionizing radiation and dose rates. In the working bias condition, the damage at high dose rate is greater than that at low dose rate and it recover during post-irradiation annealing. This is obvious time dependent effects （TDE）. While in the zero bias condition, the damage at low dose rate is greater than that at high dose rate, exhibiting enhanced low dose rate sensitivity （ELDRS）.