| 摘要 |
Predetermined reference voltages v1, v2 are A/D-converted to achieve corresponding digital data d0, d1, d2. Any reference digital values y1, y2 are set in advance so as to satisfy y1/y2=(v1-v0)/(v2-v0)=1/2. Furthermore, calculations of x1=d1-d0 and x2=d2-d0 are carried out to achieve x1, x2. A quadratic curve (quadratic function expression y=f(x)) passing a point D (x1, y1) and a point E (x2, y2) and the origin on the xy coordinate system is set as a linearly correcting expression. A shift value x achieved by subtracting d0from data ds having non-linearity from the A/D converting circuit is corrected by the linearly correcting expression thus achieved to achieve a linearly corrected value y to ds.
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