The improvement efficiently(eliminates) the quantitative error of the frequency control word, simplifies the control of DDS, decreases the required source to implement DDS.
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。
This paper briefly introduces the basic principles and the performance of DDS. Then it mainly describes how to use AD9851 chip to design a direct digital synthesis frequency source with high accuracy.
首先简要介绍DDS的工作原理及其性能，然后阐述如何利用AD985 1芯片设计一个高精度直接数字式合成频率源。
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