摘要
在一般正弦拟合法的基础上 ,提出正弦信号源谐波失真时测试 A/D动态性能的一种新的近似求解法 .利用循环逼近拟合残差最小值的方法求得正弦拟合函数 ,同时采用二分法提高算法的收敛速度 .此方法既剔除了信号源谐波失真对系统性能测试的影响 ,又可避免一般正弦拟合法中求解非线性方程组的麻烦 ,同时还能满足 ADC性能测试的精度要求 .
On the basis of studying the general method of sine fitting, a new approach of testing the A/D dynamic characteristic with the harmonic distortion existing is put forward. This approach uses the idea of circularly approximating the minimum of the fitting error to get the function of sine fitting. At the same time, dichotomy is used to improve the algorithmic velocity. It not only gets rid of the influence of harmonic distortion but also avoids the trouble of getting the solution of nonlinear equations, and it can satisfy the precise demand of ADC. The analysis of testing example shows the efficiency of this method.
出处
《北京理工大学学报》
EI
CAS
CSCD
2000年第6期757-761,共5页
Transactions of Beijing Institute of Technology
关键词
数据采集系统
信噪比
有效位数
正弦拟合
谐波失真
data acquisition system
signal to noise ratio
effective number of bits
sine fitting
harmonic distortion
