The DA converted {HEAD ~ circuit unit} is arranged between {TAIL ~ the comparator circuit unit} and the arithmetic operation amplifying circuit unit 
is arranged between
The DA converted { HEAD ~ circuit unit } is arranged between { TAIL ~ the comparator circuit unit } and the arithmetic operation amplifying circuit unit
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH