It is an object of the present invention to realize both of accuracy in minimum resolution and {HEAD ~ increase} of a dynamic range with {TAIL ~ simple circuitry}, without increasing an output bit number of an A/D converting circuit 
It is an object of the present invention to realize both of accuracy in minimum resolution and { HEAD ~ increase } of a dynamic range with { TAIL ~ simple circuitry } , without increasing an output bit number of an A / D converting circuit
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