| 基于FPGA的高精度直接数字频率合成器设计 |
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| 引用本文： | 张静,张流强,李跃文,刘青峰,李金超. 基于FPGA的高精度直接数字频率合成器设计[J]. 重庆理工大学学报(自然科学版), 2009, 23(8): 144-148 |
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| 作者姓名： | 张静 张流强 李跃文 刘青峰 李金超 |
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| 作者单位： | 重庆大学光电技术及系统教育部重点实验室; |
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| 摘 要： | 介绍了直接数字频率合成器的原理和特点,给出了利用FPGA实现DDS的方法.采用Brent-Kung二元树结构实现了流水线型累加器,该方法克服了累加器进位链过长的问题,使系统运行速度得到改善;运用并行Cordic(坐标旋转计算)算法实现幅度相位转换,包括提前计算进位方向和将后8级合并为一级,进一步减小了系统所耗硬件资源和功耗,并给出了仿真结果.
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| 关 键 词： | Cordic算法 流水线 现场可编程逻辑器件 |
Design of High Precision Direct Digital Frequency Synthesizer Based on FPGA |
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| ZHANG Jing,ZHANG Liu-qiang,LI Yue-wen,LIU Qing-feng,LI Jin-chao. Design of High Precision Direct Digital Frequency Synthesizer Based on FPGA[J]. Journal of Chongqing University of Technology(Natural Science), 2009, 23(8): 144-148 |
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| Authors: | ZHANG Jing ZHANG Liu-qiang LI Yue-wen LIU Qing-feng LI Jin-chao |
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| Affiliation: | Key Lab of Optoelectronic Technology & System of the Ministry of Education;Chongqing University;Chongqing 400044;China |
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| Abstract: | This paper mainly introduces the principles and characteristics of the DDS(Direct Digital Frequency Synthesizer),and gives the method of implementing DDS using FPGA.Brent-Kung Binary tree structure is used to implement the pipeline accumulator,which overcomes the problems of long carry-chain of accumulator and makes operating speed of the whole system improved.Parallel Cordic algorithm is used to implement conversion between phase and amplitude,calculate the revolving direction in advance and merge the ulti... |
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| Keywords: | Cordic algorithm pipeline FPGA |
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