数字抢答器设计要点.docx

数字抢答器设计摘 要随着科学研究的不断深入，学习科学、技术、知识的手段日益增加。抢答器作为一种工具，在智力和知识竞赛场合已经得到了广泛的应用。因此，抢答器的设计成为研究的热点。本文基于74系列的常用集成电路设计了一种多功能数显抢答器，该抢答器除了具有基本的抢答功能之外，还具有定时报警、数显的功能。在设计的过程中考虑了八路抢答器，的电路组成、设计思路及功能。抢答器主要由抢答模块、定时模块和报警模块组成，利用Multisim10软件对所设计的电路进行仿真，结果得到当预设过供抢答的时间，系统将完成自动倒计时。若在规定的时间内有人抢答，则计时将自动停止；若在规定的时间内无人抢答，则系统中的蜂鸣器将发响，提示主持人本轮抢答无效，实现报警功能。关键词：八路抢答器；EDA；Multisim10；报警；数显The design of digital answering racerABSTRACTWith the deepening of the scientific research, means of learning science, technology, knowledge getting more numerous.The?figure?vies?for?the?answering?device as a tool has been widely used in the intelligence and knowledge competition situation. Therefore, the design of the figure?vies?for?the?answering?device is becoming a hot spot of research. Based on common-used series of integrated circuit?,this paper design a multi-function digital display responder. The answering race’s function includes timing, counting, and alarming, besides the basic function of an answering racer. Considered circuit composition, function and design ideas in the design process of the eight-way responder. The designed buzzer is mainly composed of vies to answer first module, timing module and alarming modul. Through the Multisim10 to carry on the design of simulation, the experimental results show when?the time of buzzer has preset, the system will complete automatic countdown. If nobody answer the question on time, the alarm will give out some sound, helping the host know the race in this turn is of no use, so the function of alarming is achieved.Keywords:eight-way responder; Multisim10; alarming; digital display 目 录一 、引言21.1研究背景及意义21.2 研究现状31.3本文主要工作4二 、Multisim10以及抢答器的简介52.1 Multisim10的简介52.1.1 Multisim10 界面基本操作52.1.2 Multisim10 使用的注意事项92.2 抢答器的简介92.2.1 抢答器的需求分析92.2.2 抢答器的工作流程9三 、电路设计的具体实现123.1 系统概述123.1.1抢答器的组成框图123.1.2抢答器的基本功能以及扩展功能133.2 单元电路设计和分析143.2.1抢答电路的设计143.2.2定时电路的设计153.2.3报警电路的设计173.2.3整机电路17四 、仿真实验194.1　抢答电路仿真194.2　定时电路仿真204.3　报警电路仿真214.4　系统故障的分析234.1.1抢答锁存显示电路故障——开路234.1.2定时显示报警电路故障——