| 摘要 |
PROBLEM TO BE SOLVED: To provide an A/D converter, capable of preventing data composed of all 1s or all 0s from being outputted as its output, even if pulsing noise enters immediately before the end of sampling. SOLUTION: This successive approximation type AD converter is provided with a voltage comparator 1, a successive approximation register 2 and a DA converter 3. The voltage comparator 1 is provided with two or more differential amplifiers 11 and 12 connected in series via a capacitor pair. When an inputted analog signal is sampled, switches S21 and S22, provided between a sampling capacitor C1 and the differential amplifier 11, are turned off to thereby preventing pulsing noise from transmitting. COPYRIGHT: (C)2006,JPO&NCIPI
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