四路數字搶答器設計

電子機電論文編號:JD826  論文字數:5226,頁數:14

4路數字搶答器設計

目錄
摘 要 I
Abstract I
1 引言 1
2 設計任務與要求 1
3 方案論證 1
4 系統設計原理和電路圖 2
4.1 總體方框圖 2
4.2 硬件電路 2
4.2.1 設計的核心器件功能介紹 2
4.2.2 設計原理與電路 7
5 結束語 11
6 參考文獻 11
謝辭 12

摘 要：本文介紹了一種用74系列常用集成電路設計的高分辨率的4路搶答器。該搶答器為全數字集成電路設計，具有分組數多、分辨率高等優點。該搶答器除具有基本的搶答功能外，還具有優先能力、定時功能及復位功能。主持人通過控制開關使搶答器達到定時、復位的功能。電路主要由4D型鎖存器、與非門構成的環形振蕩器、邏輯控制電路、定時電路組成。與非門構成的可控環形振蕩器由于沒有外接任何元件，它依靠門電路自身的延遲時間而形成振蕩，因此，其振蕩頻率很高，為提高搶答組之間的分辨時間提供了條件。
關鍵詞：搶答器; 集成電路; 定時電路; 鎖存器; 環形振蕩器

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