This paper improves the accuracy of numerical correction using the data fitting method to get the equation for the step response and the cubic spline function to get the first and the second derivatives of the output voltage wave.

• 本文采用曲线拟合的方法得到方波响应的方程,并采用三弯矩样条函数求得输出电压波形的一阶、二阶导数,从而提高了数值校正的准确度。