数字合成信号源的设计

【作者】 王一冰；

【导师】 古天祥；

【作者基本信息】 电子科技大学 ， 测试计量技术及仪器， 2003， 硕士

【摘要】 以任意波形发生器为代表的新型通用信号源，是现代测试领域内应用最为广泛的通用仪器之一。它可以产生各种理想和非理想的波形信号，因而广泛应用于通信、雷达、导航等领域。 本文围绕“任意波形产生”这一课题展开研究，对直接数字合成的原理进行了探讨；分析了研制任意波形发生器所需攻克的关键技术，提出了技术解决途径；给出了系统硬件、软件的设计方案并进行了优选，同时对技术指标作了论证；最后针对调试中出现的问题进行了较深入的分析，并提出了实际的解决措施。 本信号源所能产生的信号频率为0.02Hz—5MHz，最小频率分辨率为0.02Hz，主要的数字逻辑部分采用CPLD实现，控制以及计算功能在计算机内完成，硬件电路板通过计算机的EPP口实现与计算机的数据传递；软件是在Labwindows／CVI环境中编写的。更多还原

【Abstract】 The new general signal source, represented by arbitrary wave generator, is widely used in the mordern testing field. Given the abilities of generating all kinds of ideal and none ideal signals, it has been widlely used in the domains of communication, radar, navigation, etc.This paper focuses on the generating of the arbitrary wave, discusses the principles of DDS(Direct Digital Synthesis)which are used in the generation of the wave, analyzes the key techniques in the research and presents solutions of arbitrary wave generator,. The system structures of hardware and software are presented, the performance indexes are discussed and the possibility of the system is considered. Finally, with respect to the problems in debugging and testing process, analyzing is done in some degree and the practical solutions are presented.The signal generator is based on DOS (Direct Digital Synthesize), the maximal frequency of signal is 5MHz, the minimal frequency is 0. 148Hz, its minimal resolution is 0. 148Hz. most digital logic is accomplished in CPLD (complex programmable logic device) ; the control and calculating is finished in computer, and the external hardware is communicated with computer by EPP of it; the software is programmed in the developing plat of Labwindows/CVI.更多还原