| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of A/D conversion with simple configuration. SOLUTION: When an analog input voltage Vin becomes equal with or higher than a reference voltage (+V2), a threshold voltage (+V1) is varied so as to invert output in a comparator 11a for each clock during fixed clocks by operating a binary voltage output circuit 13a. Thus, an encoder 16 alternately outputs "10" and "01" for each clock during the fixed clocks. Furthermore, when the analog input voltage Vin becomes lower than or equal with a reference voltage (-V2), a threshold voltage (-V1) is varied so as to invert output in a comparator 11b for each clock during fixed clocks by operating a binary voltage output circuit 13b. Thus, the encoder 16 alternately outputs "00" and "01"for each clock during the fixed clocks. COPYRIGHT: (C)2008,JPO&INPIT
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