{TAIL ~ First and second comparator groups} compare first and second analogue signals applied thereto, respectively, with reference voltages and convert the results of {HEAD ~ the comparison} to binary signals to output the binary signals to an encoding circuit 
{ TAIL ~ First and second comparator groups } compare first and second analogue signals applied thereto , respectively , with reference voltages and convert the results of { HEAD ~ the comparison } to binary signals to output the binary signals to an encoding circuit
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