9 kHz1.4 GHz高精度快速随机跳频DDS频率合成器

doi:10.16180/j.cnki.issn1007-7820.2019.12.006

电子科技 ›› 2019, Vol. 32 ›› Issue (12): 27-32.doi: 10.16180/j.cnki.issn1007-7820.2019.12.006

9 kHz1.4 GHz高精度快速随机跳频DDS频率合成器

王家敏,杨青慧,张怀武

电子科技大学电子薄膜与集成器件国家重点实验室,四川成都 610054

收稿日期:2018-12-07 出版日期:2019-12-15 发布日期:2019-12-24
作者简介:王家敏(1994-),男,硕士研究生。研究方向:射频微波、超高速器件与电路,数字频率合成器技术。|杨青慧(1979-),女,博士,教授。研究方向:液相外延及微波毫米波器件。
基金资助:
国家自然科学基金(61021061);国家自然科学基金(51272036);国家自然科学基金(51472046);国家自然科学基金(51002021);国家自然科学基金(61131005);国际合作基金(2012DFR10730);国际合作基金(2013HH0003)

9 kHz1.4 GHz High Precision Fast Random Frequency Hopping DDS Frequency Synthesizer

WANG Jiamin,YANG Qinghui,ZHANG Huaiwu

State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China

Received:2018-12-07 Online:2019-12-15 Published:2019-12-24
Supported by:
National Natural Science Foundation of China(61021061);National Natural Science Foundation of China(51272036);National Natural Science Foundation of China(51472046);National Natural Science Foundation of China(51002021);National Natural Science Foundation of China(61131005);International Cooperation Foundation of China(2012DFR10730);International Cooperation Foundation of China(2013HH0003)

摘要/Abstract

摘要：

为适应微波系统对频率合成器在高频率精度、频率捷变、随机跳频等方面的要求,文中设计了一种基于DDS芯片AD9914的频率合成器。论文阐述了优化频率控制字的计算方法,结合线性反馈移位寄存器LFSR产生随机跳频点,并利用FPGA对AD9914进行软硬件控制,使该频率合成器能够达到10 ^-5 Hz的频率精度以及百纳秒内的随机扫频。测试结果表明在输出9 kHz1.4 GHz频率时,该频率源频点准确,全频带扫频且跳频切换时间为90 ns,达到了高精度捷变频的目标,应用前景广阔。

关键词: FPGA, DDS, 高精度, 快速跳频, 频率控制字, LFSR

Abstract:

In order to adapt to the high requirements of microwave system for frequency synthesizer, including high accuracy, fast switching, random hopping, a frequency synthesizer based on DDS chip AD9914 was designed. The implementation of the fast frequency control word algorithm in the FPGA was combined with the LFSR to generate random frequency hopping points. FPGA was used to control the AD9914 and the frequency synthesizer was capable of achieving frequency accuracy of 10^-5 Hz and random frequency sweeping within 100 ns. The experimental results showed that when the output frequency was between 9 kHz to 1.4 GHz, frequency point was very accurate, the full-frequency sweeping could be realized and the frequency hopping switching time was 90 ns, which achieved the goal of high-precision agile frequency signal generator and had broad application prospects.

Key words: FPGA, DDS, high precision, fast frequency hopping, frequency control word, LFSR

中图分类号:

TN743

王家敏,杨青慧,张怀武. 9 kHz1.4 GHz高精度快速随机跳频DDS频率合成器[J]. 电子科技, 2019, 32(12): 27-32.

WANG Jiamin,YANG Qinghui,ZHANG Huaiwu. 9 kHz1.4 GHz High Precision Fast Random Frequency Hopping DDS Frequency Synthesizer[J]. Electronic Science and Technology, 2019, 32(12): 27-32.

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9 kHz1.4 GHz高精度快速随机跳频DDS频率合成器

9 kHz1.4 GHz High Precision Fast Random Frequency Hopping DDS Frequency Synthesizer

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