单极性ADC静态参数的测试方法

Test method for static parameter of unipolar ADC

模数转换器(ADC)的静态指标包括微分非线性(DNL)和积分非线性(INL),测量静态参数的主要方法为码密度直方图法。传统的码密度直方图法对输入正弦波的幅值的计算精度有较高的要求,提出了一种基于码密度直方图的归一化处理的平台方案。根据测试要求,选取符合要求的测试激励幅值输入,从而对归一化处理后的方案有效性进行验证。实验结果表明进行归一化处理降低了正弦波幅值的变化对于码密度直方图法的影响,提高了码密度直方图法测试的稳定性。

The static parameters of analog to digital converter(ADC)include differential nonlinearity(DNL)and integral nonlinearity(INL).The main method to measure static parameters is the code density histogram method.The traditional code density histogram method has high requirements on the calculation accuracy of input sinusoidal amplitude.This paper proposes a normalized processing platform scheme based on code density histogram.According to the test requirements,the test excitation amplitude that meets the requirements is selected to verify the effectiveness of the normalized scheme.The experimental results show that normalization reduces the influence of sinusoidal amplitude change on the code density histogram method and improves the stability of the code density histogram method.