电子技术(数字部分)第二版课后习题参考答案

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1第1章1.1将下列十进制数转换为二进制数、八进制数和十六进制数(要求转换误差不大于2-4):(l)43(2)127(3)254.25(4)2.718解:(1)243122112100251220211043=(101011)B(101011)B=(53)O(00101011)B=(2B)H(2)212712631231121512712312110127=(1111111)B(001111111)B=(177)O(01111111)B=(7F)H(3)225400.252127126311023121512711.00123121120254.25=(11111110.01)B(011111110.010)B=(376.2)O(11111110.0100)B=(FE.4)H(4)200.7182110.43600.78210.74412.718=(10.1011)B(0.1011)B=2-1+2-3+2-4=0.68750.718-0.6875=0.03052-4=0.0625满足要求。(010.101100)B=(2.54)O(0010.1011)B=(2.B)H1.2将下列二进制数转换为十六进制数:(l)(101001)B(2)(11.01101)B解:(l)(00101001)B=(29)H(2)(0011.01101000)B=(3.68)H1.3将下列十六制数转换为二进制数:(l)(23F.45)H(2)(A040.51)H解:(1)(23F.45)H=(100111111.01000101)B(2)(A040.51)H=(1010000001000000.01010001)B1.4将下列十六进制数转换为十进制数:(l)(103.2)H(2)(A45D.0BC)H0213解:(l)(103.2)H=(1×162+3×160.2×16-1)D=(259.125)D(2)(A45D.0BC)H=(1×163+4×162+5×161+13×160.11×16-2+13×16=3)D=(42077.0459)D1.5写出下列十进制数的842lBCD码。(l)(2008)D(2)(99)D(3)(48.5)D(4)(12.08)D解:(l)(2008)D=(0010000000001000)8421BCD(2)(99)D=(10011001)8421BCD(3)(48.5)D=(01001000.0101)8421BCD(4)(12.08)D=(00010010.00001000)8421BCD1.6将下列842lBCD码,求出相应的十进制数:(l)10010111(2)100010010011(3)000101001001(4)10000100.10010001解:(l)(10010111)8421BCD=(97)D(2)(100010010011)8421BCD=(893)D(3)(000101001001)8421BCD=(149)D(4)(10000100.10010001)8421BCD=(84.91)D1.7写出图题1.7(a)所示开关电路中F和A、B、C之间逻辑关系的真值表、函数式和逻辑电路图。若已知A、B、C变化波形如图习题1.7(b),画出F1、F2的波形。解:设开关闭合为1,断开为0,;灯亮为1,灯灭为0.4ABCF1F20000000100010000110110001101111101111111FABC1()F2ABCAABF2C1.8用逻辑代数定律证明下列等式:(l)AABAB(2)ABCABCABCABAC(3)AABCACDCDEACDE()证:(l)AAB(AAAB)()1(AB)AB(2)ABCABCABCACBB()ABCACABC&≥1≥1&F1BCF1F25ACCB()ABC()ABAC(3)AABCACDCDEA()(1BC)ACDCDE()(AACD)(CDE)ACDCDEACDE1.9画出实现下列逻辑表达式的逻辑电路图。(l)YABAC(2)YBAC()(3)Y(ABC)(D)解:B1.10写出图题1.10中各逻辑图的逻辑函数式。l)YABAC&&1ABCY2()YBACCA1&YB3)(()DBCAY11&ACDY6解:(a)FAABCBABCCABC(b)FABCBC(c)FACABBC(d)FAB1(ABC)F2ABC1.11已知逻辑函数YABBCAC,试用真值表、卡诺图和逻辑图(用非门和与ABCY0000001101017非门)表示。解:真值表ABC1.12用代数法化简下列各式(1)ABBCA()(2)(ABAB(3)ABCBC()(5)ABABABAB(6)(AB)(AB)(ABAB)()(7)BABCACAB(8)ABCABCABCABC(9)ABCDABDBCDABCBDBC(10)ACABCBCABC解:(1)ABBCAABBCABAABCABABC()(1)AB(2)(ABABAABBABAB)(3)ABCBC()(ABCBC)()ABBBCBACBCCCABCBAB(1)ABC01111001101111011110ABC000111100101011111FABBCACABBCAC&&Y&&111)4()ABABCABAB8(4)ABABCABAB()ABBC()ABABABC()ABB()ABCABC(5)ABABABABABB()ABB()AA10(6)(AB)(AB)(ABAB)()ABAB(ABAB)()ABABAAABABBBABABABABBABAABABAB()(7)BABCACABBABCACAB()BACACABB1AB1(8)ABCABCABCABCABCABCBC(1)BC(AABC)BCABCBCABBCAC()(9)ABCDABDBCDABCDBCABCDABD(1CBCCD)()ABCDABDBCDABDDCBCBDABDCBCBD()()()ABDABCBCBDBDDABCCABDBABCBA()()ABBCBD(10)ACABCBCABCACABCBCABC(ACABCBCABCABACCACBCBCABC)()ABCAABABBCABCCBABCB(1)BCBC1.13用卡诺图法化简下列各式(1)ABCDABCDABADABC9(2)(ABBDCBDACDAB)()()(3)ABCDDBCD()(ACBDABC)()(4)LABCD(,,,)m(0,2,4,8,10,12)(5)YABCD(,,,)m(0,1,2,5,6,8,9,10,13,14)(6)YABCD(,,,)m(0,1,4,6,9,13)d(1,3,5,7,11,15)(7)YABCD(,,,)m(0,13,14,15)d(1,2,3,9,10,11)解:(2)(ABBDCBDACDAB)()()ABCBCDABDBCDABDABACDABCBCD(3)ABCDDBCD()(ACBDABC)()ABCDBCDABDBCDABCBDABDACDABCD000111100101111100011110110000001ABCDABCDABADABCABACADABCD0001111001011111000111101000000010(4)LABCD(,,,)m(0,2,4,8,10,12)CDBD(5)YABCD(,,,)m(0,1,2,5,6,8,9,10,13,14)BDCDCD(6)YABCD(,,,)m(0,1,4,6,9,13)d(3,5,7,11,15)ABACCD(7)YABCD(,,,)m(0,13,14,15)d(1,2,3,9,10,11)ADACABABCD00011110101111100011110110000000ABCD00011110011110001111011000000000ABCD00011110101111000111101100000111ABCD00011110111100011110000001111第2章2.1二极管门电路如图题2.1(a)所示,图题2.1(b)所示为输入A,B的波形.试分析电路的逻辑功,能并画出电路输出端V0的波形。解:ABD1D2VO00通通001通止010止通011通通1与逻辑VOABABCD00011110011100011110000001122.2如图题2.2(a)所示电路。(l)写出F1、F2、F3和F与输入之间的逻辑表达式;(2)画出逻辑图;(3)给定各输入波形如图题2.2(b)所示,试画出F1、F2、F3和F的波形图。FAB1F2CDF3F1F2ABCFF3ABCVOt3.0V解:1&ABCDF132.3试分析图题2.3所示的电路,写出其逻辑表达式,说明它是什么逻辑电路?解:ABTN1TP1TN2TP2TN3TP3TN4TP4TN5TP5L00止通止通止通止通止通101止通通止止通通止通止010通止止通通止止通通止011通止通止通止通止止通1同或LABABAB2.4试分析图题2.4所示的CMOS电路,说明它们的逻辑功能。FTN1TN2TN4TN3TN5TP1TP2TP4TP3TP514解:EN1EN0L高阻LA()aEN=1,TN2、TP2截止,电路不工作,L=高阻;EN=0,TN2、TP2导通,TN1、TP1为反相器,LA。()bEN1EN0L高阻LAENEN=1,TN1、TP2截止,电路不工作,L=高阻;EN=0,TP2导通,TN1、TP1为反相器,LAEN。2.5求图题2.5所示电路的输出逻辑表达式。G1G215解:LABBCDE2.6分析如图题2.6所示的逻辑电路,写出输入信号与输出信号之间的逻辑表达式。解:C1,G1不工作,G2工作F1BBC0,G1工作,G2不工作F1AA2.7TTL与CMOS接口电路如图题2.7所示,试从电平匹配的观点分析RP的作用。解:一般情况TTL器件输出高电平为2.7V,CMOS器件输入高电平要高于3.5V,因此电平不匹配,TTL器件不能直接驱动CMOS器件。为此,在电源与TTL器件输出之间接一个上拉电阻RP,以提高TTL器件的输出电平。2.8如图题2.8所示驱动电路,哪些驱动电路的连接是错误的?解:(a)错,集电极开路门(OC门)需要接上拉电阻。(b)错,普通与非门输出之间不能直接连接形成“线与”。16第3章3.1写出如图题3.1所示电路对应的逻辑表达式。LABCLABCABCABC123.2组合逻辑电路及输入波形(A、B)如图题3.2所示,试写出输出端的逻辑表达式并画出输出波形。解:a)()LABABBCCb2LABCABC173.3设有四种组合逻辑电路,它们的输入波形A、B、C、D如图题3.3(a)所示,其对应的输出波形为W、X、Y、Z如图题3.3(b)所示,试分别写出它们的简化逻辑表达式。解:DCBAWXYZ00000110解:LABABABL18000100100010010000111000010011000101100101101011011101111000111110010100101010101011100111001101110111011110000011110101WCBDCADCAXBADBCBADCAYDCBDCBDCAZCADCBDCBDBADBA3.4试分析图题3.4所示逻辑电路的功能。解:LABCDBADC00011110W011110001111011000001110BADC00011110X011110001111011000001110BADC00011110Y011110001111011000001110000BADC00011110Z01100011110110001000019ABCDL00000000110010100110010010101001100011111000110010101001011111000110111110111110输入奇数个1,输出为1;输入偶数个1,输出为0。3.5试分析图题3.5所示逻辑电路的功能。ABL1L2L300001解:1LABA
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