基于DDS与数字电位器的正弦信号发生器设计

摘要

In order to make the waveform generator for medical electromagnetic navigation system small and convenient,this paper introduces a sinusoidal signal generator using DDS chip AD9833 and digital potentiometer AD5252.Based on the MCU C8051F320,the frequency and phase can be controlled by MCU via SPI communication with AD9833.Besides,the amplitude can be adjusted by IIC communication with MCU and digital potentiometer AD5252.At the same time,the system has developed a host computer interface based on VB for convenient control.The experimental results show that the signal generator is reliable,easy to control with high accuracy output.%为了实现医用电磁导航系统波形发生装置的小型化、便捷化,介绍了一种采用DDS芯片AD9833与数字电位器AD5252芯片来产生幅值、频率、相位均可调的正弦信号发生装置.系统利用C8051F320单片机通过SPI通信控制AD9833来调节正弦波的频率、相位,通过IIC通信控制数字电位器AD5252配合运算放大器实现正弦波幅值的调节.同时,开发了一个基于VB语言的上位机界面,能实现直观、便捷的控制.实验结果表明,本信号发生装置工作可靠、易于控制、输出信号精度高.