【作者】 王伟；

【导师】 卢博友；

【作者基本信息】 西北农林科技大学 ， 机械设计及理论， 2008， 硕士

【摘要】 信号源无论在教学、科研还是在工程技术保障中,都有着广泛的使用。从理论到工程对信号发生进行深入研究,有着积极的意义。任意波形发生器是随着不断进步的计算机技术和微电子技术发展起来的一种新型信号源。直接数字频率合成是一种新的频率合成方法,它的发明和使用是信号频率合成领域的一次革命。随着数字集成电路和微电子技术的发展,直接数字频率合成技术日益显示出它的优越性。基于DDS技术的任意波形发生器具有输出频率准确、稳定、波形质量高和输出频率范围宽等一系列独特的优点。嵌入式系统是21世纪信息产业新的经济增长点,是振兴我国信息产业的突破口。在硬件上,它具有体积小、重量轻、成本低、功耗低、可靠性高、使用专用的嵌入式CPU等特点。在软件上,具有代码体积小、效率高、响应速度快、能够处理异步并发事件、具有实时处理能力等特点。用ARM微处理器实现对DDS信号的各种控制,能准确快速地显示各种波形,对波形进行频率、相位、幅度等调制。借助高性能的ARM处理器和先进的DDS技术,可以设计出性能优良的DDS多功能信号发生器。论文主要针对任意波信号发生器人机交互系统进行了研究和开发。确定了DDS任意波信号发生器人机交互系统的硬件和软件设计方案。根据波形发生器的功能要求,将系统划分为处理器模块、存储模块、人机接口模块、通信模块和波形输出模块,旨在获得波形发生器设计的最佳方案。本文从嵌入式开发的流程出发,深入探讨了任意波形发生器人机交互系统各模块的开发。论文完成了任意波形发生器的人机交互系统的硬件电路设计、各模块软件设计以及操作界面设计。处理器模块采用了32位微处理器芯片AT91SAM7S256。人机接口模块使用了320*96高分辨率的TFT彩色液晶显示屏,和键盘结合后,具有极佳的可操作性。通信模块包括USB和UART。波形发生模块采用波形发生板输出波形。软件方面构建了一个使用简单、信息详尽的任意波形发生器人机交互系统,支持中英文混合显示。更多还原

【Abstract】 Signal source is extensively used in teaching, scientific research and engineering technical support. From theory to practice, studying on the signal has a positive meaning. Arbitrary waveform generator is a new type of signal source, with the advancement of computer technology and microelectronics technology.Direct digital frequency synthesis is a new method of frequency synthesis, whose invention and wide use is a revolution in the field of frequency synthesis. With the development of digital integrated circuits and microelectronics technology, direct digital frequency synthesis technology increasingly demonstrated its superiority. The arbitrary waveform generator based on DDS technology has a series of unique advantages such as output frequency accuracy, stability, and high-quality output waveform frequency range and so on.Embedded System is a new economic growth point of information industry in the 21st century. It is a breakthrough of the revitalization in China’s information industry. Its hardware has a variety of special features, such as small in size, light weight, low cost, low power consumption, high reliability, the use of embedded CPU and so forth. As for its software, small in code size, high efficiency, fast response requirements, able to handle concurrent asynchronous, real-time processing capabilities and so on are its advantages. Controlling DDS signal with ARM microprocessor, can quickly and accurately display various waveform, and realize frequency, phase and scope modulation. With high-performance ARM processor and advanced DDS technology, we can design high-performance multi-functional DDS signal generator.This paper mainly conducted design and research about the development of the interactive system of arbitrary wave signal generator. We completed the hardware and software design of HCI system of DDS arbitrary waveform signal generator. According to the functional requirements of the waveform generator, the system is divided into processor module, memory module, man-machine interface module, communications module and waveform output module in order to achieve the best program of the Waveform Generator Design. Beginning with the process of the development of embedded system, the paper studied in depth the development of the modules of the arbitrary waveform generator interactive system.In the paper, we completed hardware design, software design and the operation module interface design of arbitrary waveform generator HCI system. A 32-bit microprocessor AT91SAM7S256 was used in processor module. HCI module includes a high-resolution 320 by 96 TFT color LCD display, which combined with keyboard to achieve excellent operability. Communication module includes USB and UART. Waveform generation module uses waveform generation plate to output waveform. As for software, we constructed an arbitrary waveform generator HCI system, which is easy to use, detailed on information, and can support mixed demonstration in both English and Chinese.更多还原