一种提高国产ADC模块采样精度的方法

A Method for Improving the Sample Accuracy of Domestic ADC Module

摘要:

为解决武器装备自主可控问题，以国产的处理器和多通道模数转换器（ADC）为核心，设计了一种完全国产化的多通道模拟信号采集模块。由于目前国产模拟芯片特别是模数转换器的精度指标较差，造成模拟信号采集模块精度较低，实用性较差。为提高采样精度，首先在采样时采用递推平均滤波方法，抑制采集信号中的周期性干扰，降低采集的随机误差。其次，对预先测量的几组数值进行一元线性回归，据此对采样值进行最小二乘估计，降低采集的固有偏置误差和增益误差。试验结果表明，该多通道模拟信号采集模块可同时采集多路模拟信号，采样精度高，最大采集误差由0.8%降低到0.12%，并且该模块通道间一致性好，可靠性高，国产化率达到100%，在武器装备中有良好的应用前景。

Abstract:

To solve the problem of equipment’ independence, A completely domestic multi-channel analog signal acquisition circuit based on domestic CPU and ADC is designed in this essay. In order to improve the low precision of domestic analog circuit, recursive average filter method and least square estimation method were used to reduce the random error, the inherent offset error and gain error.It could be concluded from the experiment results that the acquisition circuit could acquire multi-channel analog signal simultaneously, and had high acquisition precision. The biggest sample error was reduced from 0.8% to 0.12%. The circuit was of high reliability and of 100% domestic rate, making it have good prospect for application.