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。
Passive solar and passive ventilation design principles combine with a high-performance building envelope (composed of SIPS: structurally insulated panel system).
被动式太阳能和被动式通风设计原则结合高性能的建筑围护结构(由SIPS：结构绝缘板系统组成)。
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