| 摘要: |
| 在接收信号的数字化、软化的实现中，数字下变频起着重要的作用。本文首先介绍了数字下变频的组成结构，然后详细分析了数字下变频的工作原理，描述了在实现数字下变频时，设计方案所采用的高效滤波器——CIC滤波器和多相抽取滤波器的结构和原理。最后，用通过Simulink对数字下变频的性能进行了仿真。在仿真的基础上使用Insigllt公司的FPGA开发系统，用测试电路实测了数字下变频的性能。 |
| 关键词: 数字下变频器 FPGA CIC数字滤波器 多相滤波器 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目:教育部博士点基金"多飞行器测控技术的研究"资助项目(20010611004) |
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| Realize Digital Downconversion by FPGA |
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| Abstract: |
| Digital downcoversion plays a key role in the digitized and software-oriented process of the received signal. First, the architecture of the digital downconvertor(DDC) is introduced.Then the operational principle of DDC is analysed.At the same time, the efficient structure of digital filter is described in which DDC is adopted.Finally, the performance simulation results of the DDC is given by Simulink, and on this base,the perfomance of DDC is tested with the FPGA devoloping system of Insight corp. |
| Key words: Digital downcovertor,FPGA,CIC digital filter,Polyphase filter |
