基于FPGA的直接数字合成信号源设计  

Design of DDS signal generator based on FPGA

作　　者：张林行[1] 尚小虎[1] 赵美聪 刘阳[1] 

机构地区：[1]吉林大学仪器科学与电气工程学院,吉林长春130021

出　　处：《电子设计工程》2016年第1期172-174,共3页Electronic Design Engineering

基　　金：2013年度创新训练国家级项目(2013A65238)

摘　　要：以高级语言描述、系统级仿真和综合技术为特征的第三代EDA工具为依托,以给被测电路提供一个性能较好的信号为目的,提出了基于现场可编程门阵列(FPGA)的直接数字合成(DDS)信号源。该信号源采用直接数字频率合成技术,从"相位"的概念出发进行频率合成。主控芯片采用Cyclone II EP2C5T144C8N,实现整个电路的控制。波形的发生采用查表的方式,通过与单片机进行简单的并行通信,完成外部输入数据与芯片内部控制字的转换,以D/A转换器为核心构成波形重构电路。该信号源可以对产生的信号进行频率调节、相位调节、幅度调节。应用了锁相环技术,使输出信号频率稳定。与传统信号源相比,该设计具有灵活可控、信号多样、可靠性高等优点。Based on the third generation electronic design automation（EDA） tools that is characterized by a high-level language description, system level simulation and synthesis technology, to provide a better signal to the circuit under test, a direct digital synthesis（DDS） signal source based on field programmable gate array（FPGA） is proposed. Used with DDS technology, frequency synthesis starts from the concept of ＂phase＂. Adopt Cyclone II EP2C5T144C8 N as the master chip to control the whole circuit. Realize the happening of the waveform with the method of look-up table. External input data and chip internal control word converse through the parallel communication with single-chip microcomputer. Use D/A converter as the core of waveform reconstruction circuit. The frequency, phase and amplitude of the signal are adjustable. Phase locked loop（PLL） is used to make the output signal frequency stability. Compared with the traditional signal source, the design is of flexible control, signal diversity and high reliability etc.

关 键 词：信号源 直接数字合成 现场可编程门阵列 人机交互 串/并行通信 锁相环 

分 类 号：TN791[电子电信—电路与系统]