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Characterization of the effects of radiation-induced charge on the 1/f noise properties of power DMOS transistors

机译:表征辐射引起的电荷对功率DMOS晶体管的1 / f噪声特性的影响

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摘要

This thesis investigates the effects of ionizing radiation on the noise properties of n-channel power DMOS transistors. The pre-irradiation noise power spectral density of these transistors was found to vary as 1/ flambda where lambda (the slope of the noise power spectral density when plotted on a log-log scale) ranged from approximately 0.5 to 1.0. Radiation-induced trapped charge density was found to have a large effect on the magnitude and slope of the noise. Irradiation of devices was found to produce a more uniform distribution in time constants leading to the more ideal 1/f noise power spectrum as total dose increased. Polarity of bias applied during post-radiation anneal was found to force a distribution in time constants leading to an increase in lambda for devices under negative gate bias and a decrease in lambda for devices under positive gate bias. Radiation hardness of power MOSFETs was investigated as a function of their pre-irradiation 1/f noise. No correlation was found between noise magnitude and device hardness.
机译:本文研究了电离辐射对n沟道功率DMOS晶体管噪声特性的影响。发现这些晶体管的辐射前噪声功率谱密度变化为1 / flambda,其中λ(当以对数-对数标度绘制时,噪声功率谱密度的斜率)约为0.5至1.0。发现辐射引起的俘获电荷密度对噪声的大小和斜率有很大的影响。发现随着总剂量的增加,设备的照射会产生更均匀的时间常数分布,从而导致更理想的1 / f噪声功率谱。发现在辐射后退火期间施加的偏压极性会迫使时间常数分布,从而导致负栅极偏压下器件的λ增加,而正栅极偏压下器件的λ减小。研究了功率MOSFET的辐射硬度与预辐射1 / f噪声的关系。在噪声大小和设备硬度之间未发现相关性。

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