模数转换的精度在很大程度上取决于模数转换器的位数通过在量化前使被量化信号叠加上适当分布的噪声并对量化值作多次取样平均，有可能提高量化精度．本文通过严格的数学分析，给出了估计无偏的条件以及为满足给定量化精度所需的最少积累次数最后对采用正态分布和均匀分布噪声作为叠加噪声的情形进行了具体的分析和比较. The accuracy of the analog-to-digital conversion depends greatly on the number of bits of the ADC. It is possible to improve the quantization accuracy by superimposing properly quantized noise on the quantized signal before quantization and averaging the quantized values ​​multiple times. In this paper, strict mathematical analysis is given to estimate the unbiased conditions and to meet the given quantitative accuracy of the minimum necessary number of accumulation Finally, the use of normal distribution and uniform distribution of noise as superimposed noise were analyzed and compared in detail .