数字电路习题答案(第一章) 第一章 1.1二进制到十六进制、十进制 (1)(10010111)2=(97)16=(151)10 (2)(1101101)2=(6D)16=(109)0 (3)(0.0101111(0.5F)16=(0.37109375)10 (4)(11.001)2=(3.2)16=(3.125)10 1.2十进制到二进制、十六进制 (1)(17)10=(10001)2=(11)16 (2)(127)u=(111111(7F)16 3)00.39)o=(0.0110001l1lo1ol00001010)2=(0.63D70Ah (4)(257)o=(11001.lol1o0l1)2=(19.B3)6 1.8用公式化简逻辑函数 (1)Y=A+B (3)Y=1 (2)Y=ABC+A+B+C (4)Y=ABCD+ABD+ ACD R:Y=BC+A+B+C=C+A+B+C=1(A+A=D) :Y=AD(BC +B+C)=AD(B+C C=AD (7)Y=A+CD (6)Y=AC(CD+AB)+BC(B+ AD+CE) A: Y= BC(BAD+CE)=BC(B+AD).CE=ABCD(C +E)=ABCDE 解:Y=A+(B·CA+B+CA+B+C)=A+(ABC+BCA+B+C A+BC(A+B+C)=A+ABC+BC=A+ BC (9)Y=BC +AD+ AD AC+ad+aef+ bde+ Bde 1.9 (a) Y=ABC+BC (b) y=ABC +ABC (c) Y=AB+ACDY= AB+ACD+ACD+ACD (d)Y=AB+AC+BC.Y,= ABC ABC+ ABC +ABC 1.10求下列函数的反函数并化简为最简与或式 (1Y=AC+BC (2)了=A+C+ A+ba A#: Y=(A+ B)(A+C)AC+BC=[(A+ B)(A+C)+AC].BC (4)Y=A+B+C (AB+AC+BC+AC)(B+C)=B+C A: Y=(A+D(A+C)(B+C+ D)C= AC(A+ DB+C +D) (6)y=0 ACD(B+C+D)=ABCD 1.11将函数化简为最小项之和的形式 (Y=ABC +AC +BC F: Y=ABC +AC+BC=ABC+A(B+B)C+(A+A)BC A BC +ABC + ABC+ABC+ABC= aBC +ABC+ABC+ABC (2)Y=ABCD+ABCD+ABCD+ABCd+ABCd+ABCD数字电路 习题答案 (第一章) 1 第一章 1.1 二进制到十六进制、十进制 (1)(10010111)2=(97)16=(151)10 (2)(1101101)2=(6D)16=(109)10 (3)(0.01011111)2=(0.5F)16=(0.37109375)10 (4)(11.001)2=(3.2)16=(3.125)10 1.2 十进制到二进制、十六进制 (1)(17)10=(10001)2=(11)16 (2)(127)10=(1111111)2=(7F)16 10 2 16 10 2 16 (3) (0.39) (0.0110 0011 1101 0111 0000 1010) (0.63D70A) (4) (25.7) (11001.1011 0011) (19. 3) B = = = = 1.8 用公式化简逻辑函数 (1)Y=A+B (3)Y=1 解: (1 A+A=1) (2) = + + + = + + + = = + + + Y BC A B C C A B C Y ABC A B C AD BC B C AD B C C AD Y ABCD ABD ACD = + + = + + = = + + Y ( ) ( ) (4) 解: (5)Y=0 (7)Y=A+CD Y BC B AD CE BC B AD CE ABCD C E ABCDE Y AC CD AB BC B AD CE = ⋅ + = + ⋅ = + = = + + + + ( ) ( ) ( ) (6) ( ) ( ) 解: A BC A B C A ABC BC A BC Y A B C A B C A B C A ABC BC A B C Y A B C A B C A B C = + + + = + + = + = + ⋅ + + + + = + + + + = + + + + + + ( ) ( )( )( ) ( )( ) 8 ( )( )( ) 解: ( ) (9)Y = BC + AD + AD (10)Y = AC + AD + AEF + BDE + BDE 1.9 (a) Y = ABC + BC (b) Y = ABC + ABC (c) Y1 = AB + ACD,Y2 = AB + ACD + ACD + ACD (d) Y1 = AB + AC + BC,Y2 = ABC + ABC + ABC + ABC 1.10 求下列函数的反函数并化简为最简与或式 (1)Y = AC + BC (2)Y = A + C + D AB AC BC AC B C B C Y A B A C AC BC A B A C AC BC Y A B A C AC BC = + + + + = + = + + + = + + + ⋅ = + + + ( )( ) ( )( ) [( )( ) ] (3) ( )( ) 解: (4)Y = A + B + C ACD B C D ABCD Y A D A C B C D C AC A D B C D Y AD AC BCD C = + + = = + + + + = + + + = + + + ( ) ( )( )( ) ( )( ) (5) 解: (6)Y = 0 1.11 将函数化简为最小项之和的形式 ABC ABC ABC ABC ABC ABC ABC ABC ABC Y ABC AC BC ABC A B B C A A BC Y ABC AC BC = + + + + = + + + = + + = + + + + = + + ( ) ( ) (1) 解: (2)Y = ABCD + ABCD + ABCD + ABCD + ABCD + ABCD