| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology whereby digital analog conversion utilizing a capacitance ratio can accurately be executed. SOLUTION: 0-order bit data are supplied to a capacitor 430-0 via a charging control transistor 420-0, first bit data are supplied to a capacitor 430-1 via a charging control transistor 420-1, and second bit data are supplied to a capacitor 430-2 via a charging control transistor 420-2. The transistor size of the charging control transistors 420-0, 420-1, 420-2 is selected to be 1:2:4 in cross reference with the capacitance of the capacitors 430-0, 430-1, 430-2 whose capacitance ratio is selected to be 1:2:4. Thus, the charging applied to the capacitors 430-0, 430-1, 430-2 can be executed under the similar condition. COPYRIGHT: (C)2007,JPO&INPIT
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