基于DDS的多通道信号源设计
摘 要：为满足航空电子、雷达设备和通信系统等领域相对低相位噪声、稳定工作、高分辨率、快频率转换以及低功耗的通用信号源的需求，提出了一种采用高性能控制器C8051F020控制AD9959频率合成芯片的设计方法和软件设计流程，最终实现了单频点12 MHz,48 MHz和带宽30 MHz的线性调频3路信号输出，并对测试结果进行了分析。测试结果表明，此方案设计的信号源具有频谱纯，相噪低，转换时间快等特点，可满足实际系统的需要。
关键词：直接数字频率合成； AD9959； 线性调频信号； C8051F020单片机
中图分类号：TN919-34 文献标识码：A 文章编号：1004-373X(2011)24-0177-04
Design of Multi-channel Signal Source Based on DDS
ZHANG Ying-li1, TANG Xiao-ming2, HE Wen-long3, ZHANG Tao2
(1. China United Telecommunications Co., Ltd., Yantai 264100 China;
2. The Chinese People"s Liberation Army Navy Aircraft Engineering Institute, Yantai 246001, China;
3. Unit 91630 of PLA, Guangzhou 510320, China)
Abstract： To satisfy the requirements of general signal source with low phase noise, high stability, high resolution, quick frequency conversion and low power consumption for aerospace industry, radar equipments, communication systems and other fields, a software design flow and a design method which uses the high-powered controller C8051F020 to control the frequency synthesis chip AD9959 are proposed. A three-channel signal output with 12 MHz and 48 MHz single frequency points, and with 30 MHz bandwidth linear frequency modulation are achieved. The test results are analyzed. The results indicate that the signal source designed by the method has the characteristic of pure spectra, low phase noise and quick frequency conversion. Therefore, the signal source can satisfy the need of actual systems.
Keywords： DDS; AD9959; LFM signal; C8051F020 single chip
收稿日期：2011-07-13
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