基于DDS的固定频率正弦信号发生器的改进

介绍了一种对基于DDS的数字本振的改进,分析了传统的数控振荡器的实现方法,指出其中由于频率控制字的量化误差带来的振荡器输出相位误差。分析上述误差出现的原因,指出了传统实现方法不具有普遍性,并给出了一种解决这种误差的方案。给出了仿真结果,通过2种方法的对比,清晰地显示出改进所带来的效果。从而有效地解决了由于频率控制字的所带来的量化误差,简化了DDS的控制,减少了实现DDS所需资源。基于以上的优势,可以显著地缩短DDS的开发时间,简化系统设计。

Improvement of Fixed Frequency Sine Signal Generator by DDS

An improvement to the traditional Direct Digital Synthesizer is introduced.Through analyzing the traditional implement method,the phase(error is) introduced by the quantization error of the frequency control word is put forward.The cause of the phase(error) is analyzed through which we can find that the traditional method is not universal and a technique to solve the problem is provided.The simulation results are given.Through comparing the two results,the improvement is clearly shown.The improvement efficiently(eliminates) the quantitative error of the frequency control word,simplifies the control of DDS,decreases the required source to implement DDS.Because of the advantages,the method decreases the time to design DDS,simplifies the system design workload.