【摘要】 直接数字合成器(DDS)具有较高的频率分辨率,可以实现频率快速切换,并且在频率改变时能保持相位的连续,很容易实现频率、相位和幅度的数字调制。从DDS的原理出发,介绍了一种基于DSP Builder查找表结构的DDS设计,并通过QuartusⅡ完成对FPGA器件的配置下载过程。可编程逻辑器件具有器件规模大、工作速度快及可编程的硬件特点,非常适合用来实现DDS。更多还原

【Abstract】 Direct Digital Synthesizer(DDS) has high frequency resolution which may realize the frequency fast cut,maintain the phase continual and be very easily to realize digital modulation of frequency,phase and amplitude.This paper sets out from the principle of DDS,introduces a kind of DDS design based on DSP Builder lookup table configuration and completes the configuration downloading process to FPGA device through QuartusⅡ.The programmable logical device has big scale,quick working speed and is programmable which is extremely suitably used to realize DDS.更多还原