A method for correcting A/D converted output data which corrects digital data
obtained
by A/D conversion of an analog signal, comprising forming an at least first order
polynomial curve approximating an input/output characteristic curve of A/D conversion
in a range of input of the analog signal, setting an ideal input/output characteristic
line of A/D conversion, deriving a conversion equation for converting coordinates
of a point on the approximation polynomial curve to a point of the ideal input/output
characteristic line for the same analog signal value, and using this conversion
equation to convert A/D converted digital data so as to correct non-linearity of
the output data.
