Mechanism of anomalous recovery in advanced SiGe bipolar transistors after low dose rate irradiation for very high total doses

The possible physical mechanism of the anomalous recovery effect in SiGe bipolar transistors is described. The qualitative analysis of saturated oxide trapped charge and interface trap densities at very high total doses as a function of dose rate affords an explain of decreasing excess base current and increasing current gain during further low dose rate irradiation.     

双极晶体管的高温变剂量率辐照效应

研究了双极晶体管的变剂量率电离辐射损伤,发现从高到低的变剂量率辐照更有利于低剂量率辐射损伤增强效应的加速评估.     

不同偏置下10位双极模数转换器高低剂量率的辐射效应

研究了10位双极模数转换器(ADC)在60Coγ射线不同剂量率、不同偏置条件辐照下的电离辐射效应及退火特性。研究结果发现,此类模数混合信号电路在不同偏置和不同剂量率辐照下的电离辐照响应有较大差异。同一电参数既表现出低剂量率损伤增强效应(ELDRS)又表现出时间相关效应(TDE)。研究结果进一步表明,低剂量率辐照0 V偏置是最劣偏置;与之相反,高剂量率辐照5 V偏置是最劣偏置,而加电阻偏置对辐照损伤有一定的抑制作用。最后,结合空间电荷模型和边缘电场效应对其辐照损伤差异及退火机理进行了初步探讨。     

12位双极数模转换器高低剂量率的辐射效应

通过对12位双极数模转换器在60Co γ射线的高低剂量率的辐照实验和室温退火实验的对比分析,发现数模混合电路在不同剂量率辐照下的电离辐照响应有很大差异.这种混合电路不但表现出明显的低剂量率损伤增强效应,而且表现出时间相关效应.结合辐射响应测试过程和空间电荷模型,对其损伤模块和辐射损伤机理进行初步探讨.     

Dose-rate effects of p-channel metal oxide semiconductor field-effect transistors at various biasing conditions

The total-dose response and annealing effect of p-channel metal oxide semiconductor field-effect transistors (PMOSFETs) were investigated at various dose rates and biasing conditions.The results show that the shift of threshold voltage is more obvious when the dose rate is decreased.Under the various dose rates and biasing conditions,some have exhibited a time-dependent effect and others showed enhanced low-dose-rate sensitivity (ELDRS).Finally,using the subthreshold-separating method,the threshold-voltage shift is separated into shifts due to interface states and oxidetrapped charges,and the underlying mechanisms of the observed effects are discussed.It has been indicated that the ELDRS effect results from the different quantities of the interface states generated at high and low dose rates.     

双极晶体管高温辐照的剂量率效应研究

文章对一种具有低剂量率辐射损伤增强效应的国产双极晶体管进行了不同剂量率、不同温度下的电离辐照试验。结果表明，室温辐照条件下，该双极器件在较高剂量率下的辐射损伤没有显著区别，但在低剂量率辐照下，辐射损伤明显增加；而在高温辐照条件下，即使辐照剂量率较高，其辐射损伤也有显著的差异。最后，讨论了这种效应可能的内在机制。     

线性稳压器不同偏置下的低剂量率损伤增强效应

A linear voltage regulator was irradiated by ~(60)Coγat high and low dose rates with two bias conditions to investigate the dose rate effect.The devices exhibit enhanced low dose rate sensitivity(ELDRS) under both biases. Comparing the enhancement factors between zero and working biases,it was found that the ELDRS is more severe under zero bias conditions.This confirms that the ELDRS is related to the low electric field in a bipolar structure. The reasons for the change in the line regulation and the max...     

NPN双极晶体管的ELDRS效应及退火行为

对国产NPN双极晶体管在不同剂量率下的辐射效应和退火特性进行了研究.结果显示:在不同剂量率辐照下,NPN晶体管的特性衰降均非常明显.不仅晶体管的过剩基极电流明显增大,直流增益迅速下降,其集电极电流也随辐照总剂量的增加而逐渐衰减,且低剂量率辐照下损伤更明显.本中对造成各种实验现象的损伤机理进行了分析.     

Effects of orientation of substrate on the enhanced low-dose-rate sensitivity （ELDRS） in NPN transistors

The radiation effects and annealing characteristics of two types of domestic NPN bipolar junction transistors, fabricated with different orientations, were investigated under different dose-rate irradiation. The experimental results show that both types o     

氧化层厚度对NPN双极管辐射损伤的影响

研究了不同氧化层厚度的两种国产NPN双极晶体管在高低剂量率下的辐射效应和退火特性。结果显示,随总剂量的增加,晶体管基极电流增大,电流增益下降,且薄氧化层的晶体管比常规厚氧化层的晶体管退化更严重。另外,两种NPN晶体管均表现出明显的低剂量率损伤增强效应。本文对各种实验现象的损伤机理进行了分析。