提高ADC精度方法

Method to Improve Precision of ADC

为满足低成本实现高速、高精度模数转换器(ADC:Analog-to-Digital Converter)的要求,提出了一种以低位数ADC实现高位数ADC的方法。该方法采用单片机比较器作为1位ADC,在被测信号上叠加一个扰动信号,经过多次模数转换并累加,达到多位高精度ADC的效果。实验结果验证了该设计电路的合理性和正确性,实现了低成本ADC在高精度测量中的应用。

In order to meet the low-cost high-speed, high-accuracy ADC （Analog-to-Digital Converter ）requirements, this paper presents a low number to the number of ADC to achieve a high level approach. Themethod uses a single chip as a comparator ADC, the signal is superimposed on a disturbance signal, after severalanalog to digital conversion and accumulating a number of high-precision ADC to achieve results. Experimentalresults show that the designed circuit is reasonable and correct, to achieve a low cost ADC in high precisionmeasurement.