毕业设计（论文）-基于52单片机的低频信号发生器设计.doc

密级:
摘要
信号发生器是一种应用广泛的信号源,它经常应用在自动控制系统电、子技术实验等科研领域。
目前, 有很多的信号发生器构成方法,例如采用专用的信号发生芯片MAX038、采用DDS(Direct2Digital Synthesis)型的任意波发生器、以及传统的AWG等。
该可调低频信号发生器的设计以单片机(AT89C52)作为核心控制系统,由晶体振荡电路,地址发生电路,波形产生电路,运算放大电路,数字模拟转换电路组成。由于输出波形的频率较低,所以决定使用AT89C52作为控制电路,用中断查表法形成波形的数据输出,再用D/A转换器输出需要的波形信号。该信号发生器可以输出正弦波,方波,三角波三种波形,可提供输出频率从1HZ--10KHZ的方波以及频率从1HZ--5000HZ的正弦波(三角波)。该设计适用于初学者将其作为一学****板使用,系统价格低廉,功能实用。
关键词:可调低频信号发生器;AT89C52; 正弦波;方波;三角波
Design of  Adjustable Low-frequency Signal Generator Based on the MCU
Abstract
Signal generator is a staple signal source ,which is widely used in automatic control system, the experiment of electronic technology and other scientific research field .
At present, the signal generator has many methods to design, such as the dedicated chip MAX038, the signal generator based on DDS (Direct2Digital Synthesis)as well as the traditional, such as AWG.
The Adjustable Low-frequency Signal Generator consists of the microcontroller AT89C52, the crystal circuit, the address maker circuit, the waveforms maker circuit, the operational amplifiers circuit and the transformation circuit between analog signals and digital signals. For the output signals are low frequency, we choose the microcontroller AT89C52 which use the interrupt lookup method to output the waveform data. The Signal Generator can output three waves including sine wave, square wave, triangle wave. The range of frequency is 1HZ~2KHZ. The design can be used as a developed target board by beginners, and the cost of the system is inexpensive, nevertheless, the function is applied.
Key words: signal generator; AT89C51;frequency of output; Sine wave; Square Wave; Triangle wave.
目录
摘要 Ⅰ
Abstract II
第一章绪论 1
1
1
AT89C52芯片的介绍 2
TLC7528数模转换器的介绍 7
第二章单片机的仿真软件的应用 8
Proteus ISIS软件的应用介绍 8
Keil软件的应用介绍 9
第三章可调低频信号发生器的设计 10
信号发生器设计的基本要求 10
信号发生器的电路设计与仿真 10
: 10
软件设计部分: 11
: 15
信号发生器的实物制作 21
Protel Dxp制版: