DDS的精密正弦信号发生器的设计毕业论文毕业设计电.doc

基于DDS的精密正弦信号发生器的设计 PAGE PAGE I 基于DDS的精密正弦信号发生器的设计 摘 要 本设计采用了直接数字频率合成（DDS）技术来实现。侧重叙述了用FPGA来完成直接数字频率合成器(DDS)的设计，DDS由相位累加器和正弦ROM查找表两个功能块组成，其中ROM查找表由兆功能模块LPM_ROM来实现。而通过设定不同的累加器初值(K1)和初始相位值(K2)，可以调节两路相同频率正弦信号之间的相位差，从而产生数字式的频率、相位和幅值可调的精密正弦波信号，最后通过MAX+PLUSII演示仿真结果。 与传统的频率合成方法相比，DDS合成信号具有频率切换时间短、频率分辨率高、相位变化连续等诸多优点。使用单片机灵活的控制能力与FPGA器件的高性能、高集成度相结合，可以克服传统DDS设计中的不足，从而设计开发出性能优良的DDS系统。 关键字 单片机 DDS FPGA 正弦信号发生器 DDS-BASED PRECISION SINUSOIDAL SIGNAL GENERATOR ABSTRACT This design uses a direct digital frequency synthesis (DDS) technologies. Described with emphasis on FPGA to complete the direct digital synthesizer (DDS) design, DDS ROM from the phase accumulator and sine lookup table composed of two functional blocks, including ROM look-up table by the function module LPM_ROM trillion to implement. The accumulator by setting different initial (K1) and the initial phase value (K2), the same frequency can be adjusted two phase difference between the sinusoidal signal, resulting in digital, frequency, phase and amplitude adjustable precision sine wave signal, the final presentation by MAX + plus II simulation results. And compared to the traditional method of frequency synthesis, DDS synthesized signal with frequency switching time is short, high frequency resolution, phase change continuously, and many other advantages. Flexible control using microcontroller and FPGA device performance, highly integrated combination of design can overcome the deficiencies of traditional DDS to design and develop excellent performance DDS system. KEY WORDS single chip computer DDS FPGA Sinusoidal signal generator 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc295371856 摘 要 PAGEREF _Toc295371856 \h I HYPERLINK \l _Toc295371857 ABSTRACT PAGEREF _Toc295371857 \h II HYPERLINK \l _Toc295371858 1 绪论 PAGEREF _Toc295371858 \h 1 HYPERLINK \l _Toc295371859 1.1 课题背景 PAGEREF _Toc295371859 \h 1 HYPERLINK \l _Toc295371860 1.2 研究此课题的目的和意义 PAGEREF _Toc295371860 \h 1 HYPERLINK \l _Toc295