{HEAD ~ The AD converter} includes: {TAIL ~ an arithmetic operation amplifying circuit unit}, a comparator circuit unit for comparing, with a reference signal, an output from the arithmetic operation amplifying circuit unit; a DA converted circuit unit for DA converting a signal based on a signal from the comparator circuit unit; and a sampling and holding unit arranged at an input section of the arithmetic operation amplifying circuit unit 
{ HEAD ~ The AD converter } includes : { TAIL ~ an arithmetic operation amplifying circuit unit } , a comparator circuit unit for comparing , with a reference signal , an output from the arithmetic operation amplifying circuit unit ; a DA converted circuit unit for DA converting a signal based on a signal from the comparator circuit unit ; and a sampling and holding unit arranged at an input section of the arithmetic operation amplifying circuit unit
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