Design and Implementation of Embedded Signal Generator Based on AD9850

DDS technlogy is a kind of digital frequency synthesis technology that synthesizes the wave directly from the concept of phase,a design proposal of the sine and square waveform generator,based on the DDS chip AD9850 and the ultralow-power microcontroller MSP430F149 is introduced.It can provide Sine and square wave,the range of which is from 1 Hz~10 MHz.The frequency can be set by the keyboard,and it can generate a step frequency signal by different steps.The amplitude of the signal also can be adjusted.The basic principle of DDS,the hardware connection circuit of MSP430 and AD9850,the way to eliminate the mixed and noise signals and software design of the whole system are introduced.Through experiments testing,it can be seen that this kind of signal generator designed has high accuracy,wide frequency,simple structure,easy to use and high reliability.The output signal has stable frequency and has no obvious distortion.