| 基于FPGA的直接数字频率合成器设计与仿真 |
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| 引用本文： | 王清,何松柏,钟自鸣. 基于FPGA的直接数字频率合成器设计与仿真[J]. 世界科技研究与发展, 2010, 32(4): 430-432 |
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| 作者姓名： | 王清 何松柏 钟自鸣 |
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| 作者单位： | 电子科技大学电子工程学院,成都611731 |
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| 摘 要： | 在研究传统频率合成器理论的基础上,提出了一种改进的直接数字频率合成器DDS(Direct Digital Frequency Synthesizer,简称DDS);研究了使用FPGA Statix Ⅱ系列芯片,实现32位DDS的设计方法;给出了1/4查找表压缩;采用了注入相位抖动等优化方法;并且分析了DDS输出频谱杂散的误差来源。实验结果表明,改进后的DDS在产生高精度正弦波的同时,其无杂散动态范围可以改善9个dB,达到90dB。
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| 关 键 词： | 直接数字频率合成技术 相位累加器 相位截断 压缩存储查找表 |
Design and Simulation of DDS based on FPGA |
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| WANG Qing,HE Songbai,ZHONG Ziming. Design and Simulation of DDS based on FPGA[J]. World Sci-tech R & D, 2010, 32(4): 430-432 |
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| Authors: | WANG Qing HE Songbai ZHONG Ziming |
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| Affiliation: | ( School of Electronic Engineering, University of Electronic Science and technology of China, Ehengdu 611731 ) |
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| Abstract: | Based on the traditional frequency synthesizer theory, an improved direct digital synthesizer （DDS） is given. To get the 32-bit DDS design,FPGA Statix II series chip and 1/4 look -up table eontpression are used. Phase jitter injection and other optimization methods are proposed. Moreover, error sources of the DDS spectrum spurious output are analyzed. Experimental results show that the improved DDS can generate sine wave with a high precision, meanwhile the spurious free dynamic range can achieve 90dB,which improves for 9 dB. |
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| Keywords: | DDS phase accumulator phase truncation rom compression |
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