函数信号发生器设计文档

文档编号:JD065    字数:5686,页数:27

摘 要: 本系统能够产生正弦波、方波、三角波。同时还可以作为频率计测频率。函数信号的产生由MAX038和外围电路完成，能产生1Hz—20MHz的波形。波形选择由单片机完成。输出或输入频率经74HC390分频后，由单片机完成自动频率检测显示。

关键词：波形产生器、频率计、MAX038、74HC390、AT89S51。

Abstract: this system can have the sine wave, the square-wave, the triangular wave. Simultaneously may also take the frequency measurement frequency. The function signal's production completes by MAX038 and the peripheral circuit, can have the 1Hz-20MHz profile. The profile choice completes by the monolithic integrated circuit. Output or input frequency after the 74HC390 frequency division, completes the automatic frequency detection demonstration by the monolithic integrated circuit.

key word: Profile producer, frequency meter, MAX038, 74HC390, AT89S51.

目 录
引言 .............................................................................3
一、整体设计思路 .................................................................4
(一)方案设计与论证 ...............................................................4
(二)设计简介......................................................................4
二 主要芯片简介 ..................................................................6
(一)MAX038工作原理 ...............................................................6
(二)MAX038芯片介绍................................................................7
二 硬件设计...................................................................... 9
(一)信号发生部分 .................................................................9
(二)频率计数器部分 ..............................................................11
(1)AT89S51介绍 ..................................................................11
(三)利用AT89S51计数 .............................................................12
(四)放大整形.....................................................................13
(五)LED显示 .....................................................................13
四 软件设计 .....................................................................14
(一)程序框图 ....................................................................14
(二)源程序 ......................................................................15
(三)性能指标 ....................................................................19
小结 ............................................................................20
致谢 ............................................................................21
参考文献........................................................................ 23
附录 ............................................................................24
信号发生器电路原理图............................................................ 24
信号发生器实物图 ................................................................26

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