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。
The pulsed power source is developed on the principles of small size, low cost, convenient operation and high performance reliability.
所研制的小能量脉冲功率电源体积小、成本低、操作方便且运行可靠。
In this article, some principles and points of attention for shopping high-fidelity earphone are descried in terms of its kinds and performance.
耳机是一种常用的电子器件，从耳机的种类、性能指标入手，具体介绍了选购Hi - fi耳机的若干原则及注意事项。
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