| 一种用于符号同步的奈奎斯特滤波器优化设计 |
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| 引用本文： | 叶双应, 吴建辉, 王春林, 姜爱鹏,.一种用于符号同步的奈奎斯特滤波器优化设计[J].电子器件,2006,29(2):493-496. |
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| 作者姓名： | 叶双应 吴建辉 王春林 姜爱鹏 |
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| 作者单位： | 东南大学国家专用集成电路工程技术研究中心,南京,210096 |
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| 摘 要： | 本文设计了一种用于完成QAM数字电视解调芯片中符号及匹配成形功能的奈奎斯特滤波器。对数字前端中的传统结构进行联合设计，系统结构得到优化。通过对滤波器结构的优化设计，减小了所设计的滤波器的门级电路规模，从而降低了芯片的版图面积。仿真结果表明，该滤波器通带纹波小于0．4dB，带外抑制小于-43dB。满足DVB-C标准的要求。
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| 关 键 词： | 奈奎斯特滤波 采样率转换 符号同步 |
| 文章编号： | 1005-9490（2006）02-0493-04 |
| 收稿时间： | 2005-08-22 |
| 修稿时间： | 2005-08-22 |
Design of a Nyquist Filter Used in Symbol Synchronization |
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| YE Shuang-ying,WU Jian-hui,WANG Chun-lin,JIANG Ai-peng.Design of a Nyquist Filter Used in Symbol Synchronization[J].Journal of Electron Devices,2006,29(2):493-496. |
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| Authors: | YE Shuang-ying WU Jian-hui WANG Chun-lin JIANG Ai-peng |
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| Affiliation: | National ASIC Engineering Technology Research Center, Southeast University , Nanjing 210096 , China |
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| Abstract: | This paper presents a Nyquist filter to perform symbol synchronization and matched filtering in a QAM demodulator for digital television. As a combined matched filter is designed in stead of two separate filters in digital front-end , the system is optimized. By optimizing the circuit of the combined filter, the gate-level circuit and the layout is greatly reduced. The simulation result show that the in-band ripple is less than 0. 4dB and out of band rejection is less than -43 dB, agreeing with the DVB-C specification. |
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| Keywords: | nyquist filtering sample rate conversion symbol synchronization |
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