【作者】 雷道仲；

【导师】 李仲阳；

【作者基本信息】 湖南师范大学 ， 电路与系统， 2008， 硕士

【摘要】 在现代电子测量技术的研究及应用领域中,常常需要高精度且频率可调的信号源。而随着大规模可编程逻辑器件FPGA的发展以及可编程片上系统(SOPC)设计技术的日渐成熟,为这类信号发生器的设计与实现提供了理论依据与技术支持。本课题的研究就是针对某学校数字电子技术实验室数字信号源的需求为背景展开的。本设计采用ALTERA公司的Cyclone系列FPGA为数字平台,利用VHDL语言在FPGA中设计出了产生正弦信号的DDS器件,并将其封装成IP核;然后运用了基于NiosⅡ嵌入式处理器的SOPC技术对DDS IP核加以控制。整个系统可以实现1Hz～40MHz的正弦信号输出、其最小步进频率达到1Hz;并能实现调幅、调频、二进制PSK、二进制ASK调制等功能。论文详细的介绍了该系统的软件实现和各部分的硬件实现,着重对DDS的设计过程、工作原理及其输出信号的性能进行了分析;对DDS IP核的形成、NIOS软处理器的设计与实现等问题进行了比较系统的研究。更多还原

【Abstract】 Signal sources with high accuracy and operational frequency are used in the fields of research and application of modern electronics measuring technology. With the development of FPGA in a large scale and the maturing of SOPC, design technology have provided theoretical basis and technological support for the design and realization of such signal generators.In this paper, a source of digital, with based on the need of a digital electronic lab. in one polytechnic college. In the research FPGA of Cyclone serials from ALTERA Company is used as the digital platform, DDS device which generates Sine Signals are designed in FPGA by the use of VHDL, and then package IP nuclear which is controlled by SOPC technology based on Nios II Embedded Processor. The programming in Nios can realize and choose different modulation methods. The whole system can output the sine waves with frequencies ranging from 1Hz to 40MHz, with he minimum step frequency of 1Hz. It is perfected to generate kinds of signals, including AM, FM, 2PSK and 2ASK.This thesis detailed introduces the realization of the system in software and hardware of this system, and focuses on the analysis on the designing process and operational principles DDS and on its output signal property; it also makes a systematical research on the formation of IP nuclear, and the design and realization of NIOS soft processor.更多还原