基于单片机的简易波形发生器电路的设计  

Design of a Simple Waveform Generator Circuit Based on Microcontrollers

作　　者：洪惠宇[1] 

机构地区：[1]电子科技大学电子信息工程学院,四川成都611731

出　　处：《南京工程学院学报（自然科学版）》2012年第4期67-72,共6页Journal of Nanjing Institute of Technology(Natural Science Edition)

摘　　要：本系统采用89C51单片机作为波形发生电路的核心控制器件,通过输出相应的高低电平输出方波波形,通过正比例函数关系拟合三角波形输出,通过编制正弦表实现正弦波形的输出,分别从相应端口实现数字量赋值,采用数模转换芯片DAC0832实现数字量向模拟量的转换,得到相应的模拟输出波形;利用按键调用不同的数字编码表控制不同波形的输出;通过调用不同的延时函数实现频率的调节;通过运放的调理实现幅度的调节;通过电平转换器实现从方波向TTL电平输出的转换.In this system, 89C51microcontroller is a core controlling chip for waveform generator circuits. Square waveIbrms are transited when corresponding high and low electric, al levels are produced. Triangular square waveform outputs are fitted by using proportional function relationship. Sinusoida] tables are generated to produc, e sinusoidal waves. And digital values are assigned from corresponding port. Digital value is conversed to analog value through the use of analog chip DAC0832, which produces corresponding analog output wavefo^Tns. By switching the keys, different digital encoding tables can be used to control different waveform outputs. De/ay functions can adjust frequencies and the magnitude is controlled by adjusting operational amplifier circuits. Square waves are conversed to TTL electrical level output bv usint, an electrical lewl converser.

关 键 词：51单片机 D A转化 正弦表 电平转换 

分 类 号：TN702[电子电信—电路与系统]