| 摘要 |
A low power consumption, high conversion accuracy, and high speed operation analog/digital converter, that is, a flash-type analog/digital converter provided with a top voltage comparator TC, a bottom voltage comparator BC, a switch circuit Si (1<=i<=M), a timer TM, a sweep generator SG, and a controller CO. At the start of calibration, a predetermined switch among the switch circuits is turned on to apply a predetermined reference voltage to the other terminal of a comparator Ci and to apply a calibration voltage changing in a ramp shape from a sweep generator to one terminal of the comparator Ci. Further, the inversion time of the comparator Ci is counted by the timer, the reference voltage is reselected, and the switch to be turned on is determined based on the results of the count.
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