| 摘要 |
PURPOSE:To eliminate an error generated due to response delay in a voltage comparator and to apply correct AD conversion at all times by providing a current correction means to the 2nd and 3rd reference current source, giving a correction data to them for calibration. CONSTITUTION:The 2nd reference current source 2 and the 3rd reference current source 3 are provided with DA converters 17, 18 constituting the current correction means, correction currents i4, i5 are given by giving a correction data respectively to the DA converters 17, 18 and the current i4, i5 are set so as to satisfy the relation of current ratio i1/(i1+i4)= specified value A and (i2+i4)/(i3+i5)= specified value B with respect to the actual current ratios i1/i2 and i2/i3. Then an error generated due to the response delay of a voltage comparator 11 is eliminated by applying the calibration in this way at the start of use and the correct calibration is applied automatically so as to apply correct AD conversion at all times.
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