Y = ( () + () + () ) '
= ()'()'()'
= (A (ABC)')' (B (ABC)' )' (C (ABC)')'
= (A (A' + B' + C'))' .....
= (A (B' + C'))'....
= (A' + (B' + C')')....
= (A' + BC) (B' + AC) (C' + AB)
= (A'B' + ABC) (C' + AB)
= A'B'C' + ABC
A = B = C ,Y = 1 。这是数值判断(比较)电路,输入相同,输出为 1 ,否则为 0 。