Patent ID: 6861967
Filing Date: 2005-03-01
Classification: H03M

Abstract:
1. A method of correcting non-linearity of digital data output from an A/D converting circuit for converting an analog signal to digital data, the method comprising: setting reference analog signals Vi (i=0, 1, 2, . . . , n) (V A/D-converting each of the reference analog signals Vi in the A/D converting circuit to achieve corresponding digital data di (i=0, 1, 2, . . . , n), and converting each digital data di excluding d setting as a linearly correcting expression an n-order function expression y=f(x) representing an n-order curve passing through coordinate points xj, yj of n and the origin on the xy coordinate; and achieving digital data d by A/D-converting any analog signal in the A/D converting circuit, subtracting d