四路数字抢答器设计

电子机电论文编号:JD826  论文字数:5226,页数:14

4路数字抢答器设计

目录
摘 要 I
Abstract I
1 引言 1
2 设计任务与要求 1
3 方案论证 1
4 系统设计原理和电路图 2
4.1 总体方框图 2
4.2 硬件电路 2
4.2.1 设计的核心器件功能介绍 2
4.2.2 设计原理与电路 7
5 结束语 11
6 参考文献 11
谢辞 12

摘 要：本文介绍了一种用74系列常用集成电路设计的高分辨率的4路抢答器。该抢答器为全数字集成电路设计，具有分组数多、分辨率高等优点。该抢答器除具有基本的抢答功能外，还具有优先能力、定时功能及复位功能。主持人通过控制开关使抢答器达到定时、复位的功能。电路主要由4D型锁存器、与非门构成的环形振荡器、逻辑控制电路、定时电路组成。与非门构成的可控环形振荡器由于没有外接任何元件，它依靠门电路自身的延迟时间而形成振荡，因此，其振荡频率很高，为提高抢答组之间的分辨时间提供了条件。
关键词：抢答器; 集成电路; 定时电路; 锁存器; 环形振荡器

Design of Digital Race Answering Device
 
Abstract: A kind of highly distinguishable 4-circuit race answering device is designed with a series of commonly used intergarted circuit of 74.The device is all-digital design,which is benifical to devide more groups and resolute signals.In addition to the basic function of rece answering.It also has some other advantages such as the capital of pirority,the function of timing and reset .when using it,the moderator can control the switch to fulfil its function of timing and reset. The circuit is mainly composed by the 4D latch ,the non-gate contolled by ringlike oscillator,the logic controlled circuit and the timing circuit .The oscillator has no connection with any oher component and it just brings about vibartion through the delay of circuit.So,the frequency of its vibartion is very high,which offer conditions to improve the speed of distinguishing time among group. 
Key words: Race answering device; Integrated circuit;  Timing circuit ; Latch;  Ring oscillator