针对ADC动态有效位数评价过程中激励正弦信号参数变化对其影响进行了详细深入的实验研究,发现动态有效位数评价误差最小的条件为:正弦信号峰峰值为最小量化阶梯的奇数倍,直流偏移为最小量化阶梯的整数倍,激励信号相位变化对于动态有效位数误差没有明显影响。直流偏移为最小量化阶梯的整数倍加上半个最小量化阶梯时,给动态有效位数造成的误差最大。研究所得结论可用于动态有效位数评价时的正弦信号参量选取实践中。
Abstract
Aiming at the evaluation of effective of bit of ADC converters, the influences of sinewave parameters are studied in detailed. Through experiment, one can get the conclusion: the best condition of minimum evaluation error of effective bit is that, 1) the peak to peak amplitude of sinusoidal should be odd number times of least significant bit (LSB), 2) the offset of sinusoidal must be integer times of LSB, 3) the initial phase of sinusoidal can’t influence the evaluation results of effective bit of ADC. when the offset of sinewave is the integer times of LSB adds 0.5LSB, it can make the worst error. This conclusion can be used in evaluation of effective bit of ADC converters.
关键词
计量学 /
动态有效位数 /
ADC /
误差 /
正弦参数 /
最小二乘 /
拟合
Key words
metrology /
effective bit /
ADC /
error /
sinusoidal parameters /
least mean square /
curve-fit
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