基于DDS+PLL技术的频率源的设计

摘要

Signal source is the very important parts in electronic systems, often referred to as the heart of electronic system. Signal source has a variety of way, frequency synthesis technology is adopted in this paper. DDS and PLL, in order to overcome the shortcomings, can use the combination application of frequency synthesis. This paper adopt the way of DDS incentive PLL is achieve output of 1200 MHZ to 1300 MHZ frequency synthesiz-er, analyzes the main composition unit of the circuit, the key technology and circuit unit made a more detailed instructions. Involves the key device selection, circuit simulation, noise analy-sis. The end of this article for the analysis summary.%信号源是电子系统中非常重要的部件，常常被称作电子系统的心脏。信号源有多种产生方式，本文所采用的是频率合成技术。为了克服DDS和PLL的缺点，可以采用两者相结合应用的频率合成方案。本文采用的是DDS激励PLL的方式实现1200MHz-1300MHz的信号频率输出，分析了电路的主要组成单元，对重要的技术和电路单元作了比较详细的说明。涉及关键器件的选择，电路的仿真，噪声分析。本文的最后为分析总结。