| 基于HSP50016的数字下变频处理 |
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| 引用本文： | 俄广西,龚耀寰.基于HSP50016的数字下变频处理[J].系统工程与电子技术,2003,25(3):383-385. |
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| 作者姓名： | 俄广西 龚耀寰 |
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| 作者单位： | 电子科技大学电子工程学院,四川,成都,610054 |
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| 基金项目： | 国防科技预研基金资助课题(2000J7.1.3.DZ0207) |
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| 摘 要： | 在数字信号处理中,通常需要将中频信号下变频成两路正交的I、Q基带信号,然后再作进一步的处理。而I、Q通道间的增益误差和相位误差会造成镜像干扰,影响系统性能。采用模拟方式解决镜像干扰,使得系统设计非常复杂,而且性能不佳。分析了I、Q通道的增益误差和正交误差对镜像干扰抑制比的影响,在系统中采用DDC芯片作下变频处理。实验结果证明,这种方法可以有效抑制镜像干扰。
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| 关 键 词： | 数字下变频 镜像干扰 正交 |
| 文章编号： | 1001-506X(2003)03-0383-03 |
| 修稿时间： | 2002年1月19日 |
Digital down Conversion Processing Based on HSP50016 |
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| E Guang-xi,GONG Yao-huan.Digital down Conversion Processing Based on HSP50016[J].System Engineering and Electronics,2003,25(3):383-385. |
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| Authors: | E Guang-xi GONG Yao-huan |
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| Abstract: | In digital signal processing,it is necessary to convert intermediate frequency signals to baseband signals before the further processing. But any gain error or phase error between in-phase (I)path and quadrature phase (Q)path in the system will cause hermitian image interference and degrade the performance of the system. The analog methods will make system more complex. The effect of the gain and phase errors on Hermitian image rejection is investigated. The DDC chip is adopted in the system to convert IF signals to baseband signals. The experimental results illustrate that this method is effective in Hermitian image rejection. |
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| Keywords: | Digital down conversion Hermitian image interference Quadrature |
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