全数字接收机DDS设计与实现

摘要

Direct digital synthesis (DDS)is the most extensively used frequency synthesis technology whose signal can offer high frequency resolution,fast frequency switch -ing,continuous phase,noiseless output phase or can produce any waves and own many other advantages. Thus it is widely used in communications, radar, anti-elec -tronic,instruments and other fields.This thesis introduces the basic structure and working principle of the technology firstly,designs a DDS by compiling verilong language to realize FPGA.%直接数字频率合成技术(DDS)是当前使用最广泛的频率合成技术，它所产生的信号具有频率分辨率高、切换速度快、切换时相位连续、输出相位噪声低和可以产生任意波形等诸多优点，被广泛应用于通信、雷达、电子对抗和仪器仪表等诸多领域。该文首先介绍了此技术的基本结构和工作原理，其次通过verilong语言编写设计了一个DDS系统。