基于MSP430和AD9833的信号发生器设计

Design of Waveform Simulator System Based on AD9833 and MSP430

基于MSP430单片机,采用直接数字合成DDS芯片AD9833设计一个多种波形信号发生器,可产生正弦波、三角波、脉冲波,输出波形频率为1 Hz～1 MHz.设计主要包括电源电路、控制电路、波形发生电路、滤波电路和放大电路.根据DDS芯片的特点给出程序的设计方案,包括AD9833的初始化、写控制字、合成频率等.实验测试结果证明该设计方法的正确性及可靠性.

Based on MSP430F169 MCU and AD9833 chip,a high accuracy programmable ultrasonic wave signal simulator using DDS（direct digital frequency synthesis） technique is designed.It can produce sine wave,tri-angular wave and pulse,which has 1 Hz-1 MHz frequency range of output waveform.Some modules are designed for the generator,such as power supply circuit,control circuit,waveform simulator circuit,wave filter circuit,amplify circuit and so on.The characteristics of the AD9833 chip is given,the software design methodology is provided including initiative,write control word,synthesis frequency and etc.Finally,the simulation results show the correctness and the affectivity of the proposed method.