| 摘要 |
An object of the present invention is to obtain a high A/D or D/A conversion accuracy, even when there exists a slope in the insulating layer film thickness distribution of the capacitors. The DAC comprises: a capacitor array for storing electric charges in accordance with a digital voltage signal; and an operational amplifier of which input terminal is connected with the capacitor array and amplifies a voltage which corresponds to the electric charges. Here, the capacitor array comprises a plurality of unit capacitors which comprises 2<n >divisional capacitors which are of the same shape and are connected in parallel. The divisional capacitors are linearly disposed in mirror symmetry about a center line of the capacitor array and one half of the divisional capacitors every unit capacitor is disposed at one side of the center line and another half is disposed at the another side of the center line.
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