| 摘要 |
PROBLEM TO BE SOLVED: To provide the constitution of a D/A converter and its manufacturing method for relieving a D/A converter, decided as a defective due to an operation defect of a current source or variance in current capacity, into a conforming article. SOLUTION: A spare current source (2nd current generating means) is arranged for a D/A converter of a current addition system in which a plurality of current sources (1st current generating means) supply equal currents. If there is a defective current source among the current sources, it is replaced with the spare current source means, thus the defective coming to be sound one. Further, when an error of an operation characteristic such as a differential linear error is smaller than a specified value, the correspondence relation between a decoded signal and the current generating means is replaced to make the error small, and then the error is minimized to correct the defective to the sound one. COPYRIGHT: (C)2004,JPO
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