文档库 最新最全的文档下载
当前位置:文档库 › 备考2019年湘潭大学考研复习试题_电子技术基础2017年

备考2019年湘潭大学考研复习试题_电子技术基础2017年

备考2019年湘潭大学考研复习试题_电子技术基础2017年

2014年北京中考英语试题

2014年北京市高级中等学校招生考试 英语试卷 学校____________________姓名____________________准考证号_______________________ 听力理解(共26分) 一、听对话,从下面各题所给的A 、B 、C 幅图片中选择与对话内容相符的图片.每 段对话你将听两遍.(共4分,每小题1分) 1. 2. 3. 4.

二、听对话或独白,根据对话或独白内容,从下面各题所给的A、B、C三个选 项中选择最佳选项.每段对话或独白你将听两遍.(共12分,每小题1分)请听一段对话,完成第5至第6小题. 5.What are the speakers going to do? A.To have dinner.B.To watch a match.C.To see a film. 6.Who will go with the boy? A.His friend.B.His mother.C.His sister. 请听一段对话,完成第7至第8小题. 7.What does the girl like doing? A.Playing chess.B.Playing basketball.C.Playing the piano.8.How often does she practice? A.Once a week.B.Twice a week.C.Three times a week. 请听一段对话,完成第9至第10小题. 9.Where’s Classroom F205? A.On the first floor.B.On the second floor .C.On the sixth floor.10.Where did the girl study for one year? A.In Canada.B.In America .C.In China. 请听一段对话,完成第11至第13小题. 11.What does the man do? A.A driver.B.A teacher.C.A fire fighter. 12.What does the woman think of the man’s job? A.Dangerous.B.Great.C.Boring. 13.Where are the speakers? A.In a taxi.B.On a bus.C.On a train. 请听一段独白,完成第14至第16小题. 14.What’s the girl doing now? A.Making a speech. B.Leading a discussion. C.Giving an introduction. 15.How long has the girl studied in the school? A.12 years.B.8 years.C.6 years. 16.What’s the girl’s advice on creating the future? A.Making good plans. B.Making your own decision. C.Making good use of your knowledge.

数字电子技术基础试题及答案(一)

数字电子技术基础期末考试试卷 1.时序逻辑电路一般由和两分组成。 2.十进制数(56)10转换为二进制数为和十六进制数为。 3.串行进位加法器的缺点是,想速度高时应采用加法器。 4.多谐振荡器是一种波形电路,它没有稳态,只有两个。 5.用6个D 触发器设计一个计数器,则该计数器的最大模值M=。 123(1(24.T ,图1 5 时,6.D 触发器 的Q 和Q1的表达式,并画出其波形。 图 D=Q n+1=Q 1= 7.已知电路如图4所示,试写出: ①驱动方程; ②状态方程; ③输出方程; ④状态表;

⑤电路功能。图4 1.设计一个三变量偶检验逻辑电路。当三变量A 、B 、C 输入组合中的“1”的个数为偶数时F=1,否则F=0。选用8选1数选器或门电路实现该逻辑电路。 要求: (1)列出该电路F(A,B,C)的真值表和表达式; (2ABCF 2求: (1(21.3.4.产生5.32 10分,共 70分) 1.解: 2.证明:左边 3.解: (1)化简该 函数为最简与或式: 解: F 3()43A B C D E A B C D E AB AC A D E =++++--------------=?+++--------------=++-------------分 分 分 ()()33()(1)22BC D B C AD B BC D BAD CAD BC BC BC D BA CA =++++--------------=++++--------------=++++-----------------------分 分分分

填对卡诺图圈对卡诺图-----------2分 由卡诺图可得: F A B A C D A C D B C B D =++++------------------------------2分 (2)画出用两级与非门实现的最简与或式电路图: 则可得电路图如下:------------------------------------------------2分 4.T 1=0.7T=0.7f= T 1=q= 1T T 5.6. 方程: n n n Q Q K Q 0 0000=+ 1111110(n n n n Q J Q K Q Q X +=+=⊕(2分) ③输出方程:n n Q Q Y 01=-----------------------------------------(1分) ④状态表:--------------------------------------------------------------------(3分) ⑤从状态表可得:为受X 控制的可逆4进制值计数器。-----------------------------(2分) 1.解:(1)依题意得真值表如下:--------------------------3分 0102J J Q ⊕(分)

2019年考研英语(二)真题及答案解析

2019年考研英语(二)真题及答案解析 Section I Use of English Directions: Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (10 points) Weighing yourself regularly is a wonderful way to stay aware of any significant weight fluctuations. 1 , when done too often, this habit can sometimes hurt more than it 2 . As for me, weighing myself every day caused me to shift my focus from being generally healthy and physically active to focusing 3 on the scale. That was had to my overall fitness goats. I had gained weight in the form of muscle mass, but thinking only of 4 the number on the scale, I altered my training program. That conflicted with how I needed to train to 5 my goals. I also found that weighing myself daily did not provide an accurate 6 of the hard work and progress I was making in the gym. It takes about three weeks to a month to notice any significant changes in your weight 7 altering your training program. The most 8 changes will be observed in skill level, strength and inches lost. For these 9 , I stopped weighing myself every day and switched to a bimonthly weighing schedule 10 . Since weight loss is not my goal, it is less important for me to 11 my weight each week. Weighing every other week allows me to observe and 12 any significant weight changes. That tells me whether I need to 13 my training program. I use my bimonthly weigh-in 14 to get information about my nutrition as well. If my training intensity remains the same, but I’m constantly 15 and dropping weight, this is a 16 that I need to increase my daily caloric intake. The 17 to stop weighing myself every day has done wonders for my overall health, fitness and well-being. I’m experiencing increased zeal for working out since I no longer carry the burden of a 18 morning weigh-in. I’ve also experienced greater success in achieving my specific fitness goals, 19 I’m training according to those goals, not the numbers on a scale. Rather than 20 over the scale, turn your focus to how you look, feel how your clothes fit and your overall energy level. 1.[A]Besides [B]Therefore [C]Otherwise [D]However 【答案】[C] However 【解析】此处考察逻辑关系。首段提出文章中心:定期称量自己是一种解任何显著的的体重波动的好方法。空格所在句指出:____,如果太频繁,这种习惯有时会造成损害。前文wonderful way(好方法)与后文hurt(损害)形成转折关系,故填入however(然而)。另外,however也是考研完形填空中的高频词。其他选项:therefore(因此),otherwise (否则)和besides(此外)此处不符合语境,故正确答案为[C] However。 2.[A]helps [B]cares [C]warns [D]reduces 【答案】[D] helps

2014年上海市中考英语试卷(含答案)

1 / 11 D) Maths. D) A sandwich. D) Frightened. 2014年上海市初中毕业统一学业考试 英语试卷 (满分150分,考试时间100分钟) 考生注意:本卷有7大题,共94小题。试题均采用连续编号,所有答案务必按照规定在答题纸上完成,做在试卷上不给分。 Part 1 Listening (第一部分听力) I. Listening Comprehension.(听力理解)(共30分) A. Listen and choose the right picture(根据你听到的内容,选出相应的图片)(6分) E 7.A) Chemistry. B) History. C) English. 8.A) A hamburger. B) A fruit salad. C) A hot-dog. 9.A) Tired. B) Surprised. C) Excited. 10.A) Watch TV. B) Play football. C) Go to the cinema. D) Read a book. 11.A) Fifteen minutes’walk. B) Fifteen minutes’ bus ride. C)Fifty minutes’ walk.D) Fifty minutes’ bus ride. 12.A) Thursday. B) Friday. C) Saturday. D) Sunday. 13.A) Trips. B) Computers. C) Parents. D) Jobs. 14.A) At the beach. B) At the airport. C) In the theatre. D) In the hotel. C. Listen to the passage and tell whether the following statements are true o r false (判断下列句子是否符合你听到的短文内容,符合的用“T”表示,不符合的用“F”表示)(6分) 15. My aunt and uncle sent me a bottle of honey as a birthday present last year. 16. The smell of my hair attracted lots of bees when I went outside. D A G

2019年考研英语一真题答案及解析

2019年全国硕士研究生入学统一考试英语(一)试题答案详解 Section I Use of English 1、【答案】C.Few【试题考点】词义辨析和上下文语境 【解析】此题词义辨析和上下文语境。首句为主题句:今天,我们生活在一个GPS系统,数字地图和其他导航应用程序都在我们的智能手机上唾手可得的世界。空格所在句指出:我们中_____在没有电话,个人GPS或其他导航工具的情况下直接走进树林。本句有without 与few构成双重否定表肯定,根据语义应该填入few(几乎没有人),符合文意。 2、【答案】C.run【试题考点】词组搭配 【解析】此题考查词组搭配。run on battery表示手机用电池发动,运行。其他选项:Put on(穿上;使运转);take on(承担;呈现);come on(快点;开始),语义不通顺。故正确答案为[C] run。 3、【答案】B.If【试题考点】逻辑关系 【解析】此题考查逻辑关系。空格所在句译文:____你在没有电话或指南针的情况下迷路,____找不到北方,我们有一些技巧可以帮助你导航____文明。此处为假设的情况,故填入if(如果)符合上下文的表达。其余选项:Since(因为;自从),though(虽然),until(直到)带入后,语义不通顺。故正确答案为[B]If。 4、【答案】D.literally【试题考点】词义辨析 【解析】空格所在句译文:____你在没有电话或指南针的情况下迷路,____找不到北方,我们有一些技巧可以帮助你导航____文明。此处literally表示确实地,真正地,带入原文语义通顺:你的确找不到北方。其余选项:Formally(正式地),relatively(相对地),gradually(逐渐地)带入后,语义不通顺。故正确答案为[D]literally. 5、【答案】A.back【试题考点】词义辨析和上下文语境 【解析】空格所在句译文:____你在没有电话或指南针的情况下迷路,____找不到北方,我们有一些技巧可以帮助你导航____文明。前文讲lost(迷路),此处填入back(回到)文明之地相互呼应,故正确答案为[A]back。 6、【答案】[B]off【试题考点】词义辨析和词组搭配 【解析】此处考察词义辨析和词组搭配。空格所在句的句意为:当你____路径,但不是完全______的区域,你需要回答两个问题:在这个特殊区域,哪儿条路是下坡?哪儿里有最

2014年山西省中考英语试题及答案

山西省2014年普通高中招生考试试卷 英语 第I卷(共75分) I.听力试题(每小题1分,共15分) 第一题情景反应这一大题共有5个小题,每小题你讲听到一组对话。请你从每小题所给的A、B、C三幅图片中,选出与你所听到的信息相关联的的 .............一项,并在答题卡上将该项涂黑。 1. A B C 2 A B C 3 A B C 4 A B C

5 A B C 第二题对话理解这一大题共有5个小题,每小题你将听到一组对话和一个问题。请你从每小题所给的A、B、C三个选项中,选出一个最佳选项,并在答题卡上将该项涂黑。 ( ) 6. A. Walking. B. Swimming. C. Dancing ( ) 7. A. Expensive. B. Beautiful. C. Cheap. ( ) 8. A. Strangers. B. Friends. C. Classmates. ( ) 9. A. At the museum B. On the bus. C. In the street. ( ) 10. A. She has cleaned them. B. She has thrown them away. C. She has put them under the bed. 第三题语篇理解这一大题你将听到一篇短文。请你根据短文内容和所提出的5个问题,从每小题所给的A、B、C三个选项中,选出一个最佳选项,并在答题卡上将该项涂黑。 ( )11. When did Jim wake up yesterday morning? A. At 7:45 B. At 8:00 C. At 8:15 ( )12. Why did he run to school? A. Because he liked running in the rain. B. Because the school was far from his home. C. Because there was something wrong with the bus. ( )13. What was Mr Smith doing when Jim came in ? A. He was waiting for him. B. He was giving his lesson. C. He was doing experiments. ( )14. How did Mr Smith feel at first when he saw Jim? A. He seemed pleased. B. He felt surprised. C. He was unhappy. ( )15. What can we know from the story ? A. An interesting lesson can warm students. B. You can get good grands if you like your teachers. C. Students can become more interested in study if teachers love them. II. 单项选择(每小题1分,共15分) 请你从每小题所给的A、B、C三个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。 ( )16. Last month, we went to Li Zongsheng's concert. The beautiful songs about his younger day reminded us to love _________ . A. yours B. theirs C. ours

数字电子技术基础试题及答案 (1)

. 数字电子技术基础期末考试试卷 一、填空题 1. 时序逻辑电路一般由 和 两分组成。 2. 十进制数(56)10转换为二进制数为 和十六进制数为 。 3. 串行进位加法器的缺点是 ,想速度高时应采用 加法器。 4. 多谐振荡器是一种波形 电路,它没有稳态,只有两个 。 5. 用6个D 触发器设计一个计数器,则该计数器的最大模值M= 。 二、化简、证明、分析综合题: 1.写出函数F (A,B,C,D) =A B C D E ++++的反函数。 2.证明逻辑函数式相等:()()BC D D B C AD B B D ++++=+ 3.已知逻辑函数F= ∑(3,5,8,9,10,12)+∑d(0,1,2) (1)化简该函数为最简与或式: (2)画出用两级与非门实现的最简与或式电路图: 4.555定时器构成的多谐振动器图1所示,已知R 1=1K Ω,R 2=8.2K Ω,C=0.1μF 。试求脉冲宽度 T ,振荡频率f 和占空比q 。 ………………………密……………………封…………………………装…………………订………………………线……………………… 系别 专业(班级) 姓名 学号

图1 5.某地址译码电路如图2所示,当输入地址变量A7-A0的状态分别为什么状态 时,1Y 、6Y 分别才为低电平(被译中)。 图2 6.触发器电路就输入信号的波形如图3所示,试分别写出D 触发器的Q 和Q1的表达式,并画出其波形。 图3 ………………封…………………………装…………………订………………………线………………………

D= Q n+1= Q1= 7. 已知电路如图4所示,试写出: ①驱动方程; ②状态方程; ③输出方程; ④状态表; ⑤电路功能。图4 三、设计题:(每10分,共20分) 1.设计一个三变量偶检验逻辑电路。当三变量A、B、C输入组合中的“1”的个数为偶数时F=1,否则F=0。选用8选1数选器或门电路实现该逻辑电路。要求: (1)列出该电路F(A,B,C)的真值表和表达式; (2)画出逻辑电路图。 2.试用74161、3-8译码器和少量门电路,实现图5所示波形VO1、VO2,其中CP为输入波形。要求: (1)列出计数器状态与V01、V02的真值表;

2019年考研英语一真题及答案解析完整版(20200520190227)

2019年考研已经结束,为方便考生备考,特整理2019年全国硕士研究生考试真题,供各位考生复习使用,以下是2019年英语(一)考研真题及答案解析。 Section ⅠUse of English Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (10 points) Today we live in a world where GPS systems, digital maps, and other navigation apps are available on our smart phones. 1 of us just walk straight into the woods without a phone. But phones 2 on batteries, and batteries can die faster than we realize. 3 you get lost without a phone or a compass, and you 4 can’t find north, a few tricks to help you navigate 5 to civilization, one of which is to follow the land... When you find yourself well 6 a trail, but not in a completely 7 area, you have to answer two questions: Which 8 is downhill, in this particular area And where is the nearest water source Humans overwhelmingly live in valleys, and on supplies of fresh water. 9 , if you head downhill, and follow any H2O you find, you should 10 see signs of people. If you’ve explored the area before, keep an eye out for familiar sights—you may be 11 how quickly identifying a distinctive rock or tree can restore your bearings. Another 12 : Climb high and look for signs of human habitation. 13 , even in dense forest, you should be able to 14 gaps in the tree line due to roads, train tracks, and other paths people carve 15 the woods. Head toward these 16 to find a way out. At night, scan the horizon for 17 light sources, such as fires and streetlights, then walk toward the glow of light pollution. 18 , assuming you’re lost in an area humans tend to frequent, look for the 19 we leave on

2014年江西省中考英语试题和参考答案(Word版)

(省)英语 准考证号____________________ 姓名________________ (在此卷上答题无效) 机密★2014年6月19日 江西省2014年中等学校招生考试 英语试题卷 说明:1. 本卷分为试题卷和答题卷,答案请涂写在答题卷上,不要在试题卷上作答,否则不给分。 2. 本卷共有5大题、86小题,全卷满分120分,考试时间为120分钟。 一、听力测试(25分) 现在是试听时间。请听一段对话,然后回答问题。 What is the boy going to buy? A. Some juice. B. Some oranges. C. Some apples. 答案是C。 A)请听下面5段对话。每段对话后有一小题,从题中所给的A、B、C三个选项中选出最佳选项,并在答题卷上将该项涂黑。听完每段对话后,你都将有10秒钟的时间回答有关小题和阅读下一小题。每段对话读两遍。(每小题1分) 1. Who sent thecamera to Lily? A. Her friends. B. Her grandparents. C. Her parents. 2. When will the girl have the final exam? A. Tomorrow. B. On Monday. C. On Friday. 3. Whose notebook is this? A. Jenny’s. B. Linda’s C. Bob’s. 4. Why does Peter look tired? A. He had a football match. B. He stayed up late for his exam. C. He watched a football match. 5. What does the girl mean? A. She doesn’t like swimming. B. She can’t go swimming with Tom. C. She will go swimming with her mother. B)请听下面4段对话和1段独白。每段对话或独白后有几个小题,从踢中所给的A、B、C 三个选项中选出最佳选项,并在答题卷上将该项涂黑。听每段对话或独白前你都将有30秒钟的时间阅读各小题。每段对话或独白读两遍。(每小题1分) 请听第1段对话,回答第6至第7小题。 6. What are they going to do together? A. Have violin lessons. B. Play tennis. C. Watch movies. 7. What time will they meet? A. At 5:30. B. At 6:30. C. At 7:30. 请听第2段对话,回答第8至第9小题。 8. Where does the conversation probably take place? A. In a bank. B. In a restaurant. C. In a post office. 9. How much should the man pay?

数字电子技术基础习题及答案

数字电子技术基础考题 一、填空题:(每空3分,共15分) 1.逻辑函数有四种表示方法,它们分别是(真值表)、(逻辑图)、(逻辑表达式)和(卡诺图)。 2.将2004个“1”异或起来得到的结果是(0 )。 3.由555定时器构成的三种电路中,()和()是脉冲的整形电路。4.TTL器件输入脚悬空相当于输入(高)电平。 5.基本逻辑运算有: (and )、(not )和(or )运算。 6.采用四位比较器对两个四位数比较时,先比较(最高)位。 7.触发器按动作特点可分为基本型、(同步型)、(主从型)和边沿型;8.如果要把一宽脉冲变换为窄脉冲应采用(积分型单稳态)触发器 9.目前我们所学的双极型集成电路和单极型集成电路的典型电路分别是(TTL )电路和(CMOS )电路。 10.施密特触发器有(2)个稳定状态.,多谐振荡器有(0 )个稳定状态。 11.数字系统按组成方式可分为功能扩展电路、功能综合电路两种;12.两二进制数相加时,不考虑低位的进位信号是(半)加器。 13.不仅考虑两个_______本位_____相加,而且还考虑来自___低位进位____相加的运算电路,称为全加器。 14.时序逻辑电路的输出不仅和___该时刻输入变量的取值______有关,而且还与_电路原来的状态_______有关。 15.计数器按CP脉冲的输入方式可分为__同步计数器和____异步计数器_。 16.触发器根据逻辑功能的不同,可分为_____rs______、______jk_____、___t________、___d________、___________等。 17.根据不同需要,在集成计数器芯片的基础上,通过采用__反馈归零法_________、__预置数法_________、__进位输出置最小数法__等方法可以实现任意进制的技术器。 18.4. 一个JK 触发器有 2 个稳态,它可存储 1 位二进制数。 19.若将一个正弦波电压信号转换成同一频率的矩形波,应采用多谐振荡器电路。20.把JK触发器改成T触发器的方法是 j=k=t 。 21.N个触发器组成的计数器最多可以组成2n 进制的计数器。 22.基本RS触发器的约束条件是rs=0 。

(完整版)2019年考研英语一真题

2019年英语(一)考研真题 Section Ⅰ Use of English Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (10 points) Today we live in a world where GPS systems, digital maps, and other navigation apps are available on our smart phones. 1 of us just walk straight into the woods without a phone. But phones 2 on batteries, and batteries can die faster than we realize. 3 you get lost without a phone or a compass, and you 4 can’t find north, a few tr icks to help you navigate 5 to civilization, one of which is to follow the land... When you find yourself well 6 a trail, but not in a completely 7 area, you have to answer two questions: Which 8 is downhill, in this particular area? And where is the nearest water source? Humans overwhelmingly live in valleys, and on supplies of fresh water. 9 , if you head downhill, and follow any H2O you find, you should 10 see signs of people. If you’ve explored the area before, keep an eye out for familiar sights—you may be 11 how quickly identifying a distinctive rock or tree can restore your bearings. Another 12 : Climb high and look for signs of human habitation. 13 , even in dense forest, you should be able to 14 gaps in the tree line due to roads, train tracks, and other paths people carve 15 the woods. Head toward these 16 to find a way out. At night, scan the horizon for 17 light sources, such as fires and streetlights, then walk toward the glow of light pollution. 18 , assuming you’re lost in an area humans tend t o frequent, look for the 19 we leave on the landscape. Trail blazes, tire tracks, and other features can 20 you to civilization. 1. [A]Some [B]Most [C]Few [D]All 2. [A]put[B]take[C]run [D]come 3. [A]Since [B] If [C] Though [D]Until 4. [A]formally [B] relatively [C] gradually [D] literally 5. [A] back [B] next [C] around [D] away 6. [A]onto [B]off[C]across [D]alone

(完整版)盐城市2014年中考英语试题(含答案)

盐城市2014年中考英语试题 第I卷(选择题,共60分) 一、单项选择(共15小题;每小题l分,计15分) 从A、B、C、D四个选项中选择一个可以填入句中空白处的最佳答案。 1.Where has the time gone is a beautiful _______. Can you sing it? A. picture B. song C. game D. film 2. ________good time we have had in the junior middle school! A. What B. What a C. How D. How a 3.-_______does Nancy help the old lady with her housework? -About twice a week. A.How often B. How long C. How much D. How soon 4.People usually like the TV channels with funnier programmes but ________advertisements. A.few B. little C. fewer D. less 5.It was raining _______when my sister and I got to the museum. A.badly B. softly C. hardly D. heavily 6.Many cities in China, _______Beijing, have been deeply affected by dirtier air. A.including B. behind C. without D. beyond 7.I think coffee tastes good, but not_______ likes drinking it. A.somebody B. anybody C. nobody D. everybody 8.I can’t find my notebook anywhere. I’m afraid I ______it. A.lose B. lost C. have lost D. was losing 9.The online shop sells _______clothing at a very good price. A.child and man’s B. children and men’s C. children’s and men D. children’s and men’s 10.I’m going to take him to some famous hutongs_______ he can learn more about China. A.because B. when C. so that D. as if 11.Shenzhou X, China’s fifth manned spacecraft, ________into space on June 11. 2013. A.has sent B. was sent C. will send D. is sent 12.-Could you tell me _________? -Sure. Walk straight along this street and you’ll find it. A.how can I get to the post office B. where is the post office C. which is the way to the post office D. how far the post office is 13.UNICE was ______in 1946. It works to help children live a better life. A.set up B. put up C. picked up D. turned up

数字电子技术基础试卷及答案套

数字电子技术基础1 一.1.(15分) 试根据图示输入信号波形分别画出各电路相应的输出信号波形L1、L2、L3、L4、和L5。设各触发器初态为“0”。 二.(15分) 已知由八选一数据选择器组成的逻辑电路如下所示。试按步骤分析该电路在M1、M2取不同值时(M1、M2取值情况如下表所示)输出F的逻辑表达式。 八选一数据选择器输出端逻辑表达式为:Y=Σm i D i,其中m i是S2S1S0最小项。 三.(8分) 试按步骤设计一个组合逻辑电路,实现语句“A>B”,A、B均为两位二进制数,即A (A1、A0),B(B1、B0)。要求用三个3输入端与门和一个或门实现。 四.(12分) 试按步骤用74LS138和门电路产生如下多输出逻辑函数。 74LS138逻辑表达式和逻辑符号如下所示。 五.(15分) 已知同步计数器的时序波形如下图所示。试用维持-阻塞型D触发器实现该计数器。要求按步骤设计。 六.(18分) 按步骤完成下列两题 1.分析图5-1所示电路的逻辑功能:写出驱动方程,列出状态转换表,画出完全状态转换图和时序波形,说明电路能否自启动。 2.分析图5-2所示的计数器在M=0和M=1时各为几进制计数器,并画出状态转换图。 图5-1

图5-2 七. 八.(10分) 电路下如图所示,按要求完成下列问题。 1.指出虚线框T1中所示电路名称. 2.对应画出V C 、V 01、A 、B 、C 的波形。并计算出V 01波形的周期T=?。 数字电子技术基础2 一.(20分)电路如图所示,晶体管的β=100,Vbe=0.7v 。 (1)求电路的静态工作点; (2) 画出微变等效电路图, 求Au 、r i 和r o ; (3)若电容Ce 开路,则将引起电路的哪些动态参数发生变化?并定性说明变化趋势. 二.(15分)求图示电路中a U 、b U 、b U 、c U 及L I 。 三.(8分)逻辑单元电路符号和具有“0”、“1”逻辑电平输入信号X 1如下图所示,试分别画出各单元电路相应的电压输出信号波形Y 1、Y 2、Y 3。设各触发器初始状态为“0”态。 四.(8分)判断下面电路中的极间交流反馈的极性(要求在图上标出瞬时极性符号)。如为负反馈,则进一步指明反馈的组态。 (a ) (b )

相关文档
相关文档 最新文档