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2005 年仪表技术与传感器 2005
第 10 期 Instrument Technique and Sensor No 10
基于 DDS 技术的频率合成源设计
邓重一
(罗定职业技术学院电子工程系,广东罗定 527200)
摘要:直接数字合成(DDS) 是一种重要的频率合成技术,采用该技术产生的信号,具有频率转换速度
快、频率分辨率高、频率稳定度高、相位变换连续、相位噪声低、集成度高、易于控制及性价比高等多种优
点,可用于各种对信号频率的性能指标要求高的场合。详细介绍了高性能 DDS 芯片 AD9858 的基本原理
和结构特点,以及单片机 PIC18F442 芯片的结构、性能特点和相关接口电路。描述了利用该芯片作为核心
芯片组成频率源的全过程,包括设计原理、硬件电路和软件设计的主要流程图。
关键词:频率源;直接数字合成技术;AD9858 芯片;原理;设计
中图分类号:TP271 5 文献标识码:A 文章编号:1002 - 1841(2005) 10 - 0037 - 04
Design of Frequency Synthesizes Source Based on DDS Technology
DENG Zhong yi
(Electronic Engineering Department of Luoding Vocational and Technological College , Luoding 527200 ,China)
Abstract :It is a kind of important frequency synthetic technology that the direct figure is formatted (DDS) , adopt the signal that this
technology produces , the conversion speed of frequency is fast , the resolution ratio of frequency is high , frequency is steady degree is
high , the phase varies in ession , the phase noise is low , the integrated easy , easy to control and the cost performance is low , etc.
It can used in various kinds of to signal performance occasion that index expect much of frequency. This text has introduced the basic
principle of high performance DDS chip AD9858 and structure characteristic in detail , have described that utilizes this chip to make up
the whole cours