基于DDS的数字频率合成研究与实现

The Study and Realization of Digital Frequency Synthesis Based on DDS

针对数字频率合成过程中相位-正弦幅度变换、平滑输出、滤波等存在的动态性及不稳定性,采用AD9833对信号合成模块的电路进行了设计。其中主要包括外围电路、滤波电路和放大电路。根据芯片的特点给出了程序的设计思路,包括AD9833初始化、写控制字、合成频率等。实验测试结果证明了该设计方法的正确性及可靠性。

Some issues are deals with during the synthesis of digital frequency signals such as change of phase and sine amplitude,smooth output and wave filter which features dynamics and variability.Utilizing AD9833 chip, the circuit is design that is used for synthesizing digital frequency signals,including external circuit,wave filter circuit and amplify circuit.The characteristics of this chip is given,the procedure design methodology is provided that includes AD9833 initiative,write control and synthesis frequency.The testing experiments indicate the accurateness and reliability of this design.