Which of the following statements are correct for the A/D converters: a) The advantage of using a dual-slope A/D converter in a digital voltmeter is that its accuracy is high. b) The number of comparators in a 4-bit flash A/D converters is 15. c) The minimum number of comparators required to build an 8-bit flash A/D converter is 256. d) The number of comparators required in a 3-bit comparator type A/D converters is 8.
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