二次型DDC结构的滤波分析

2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) Pub Date : 2017-10-01 DOI:10.1109/ICEMI.2017.8265912

Guo Lianping, Meng Jie, Tan Feng, Zeng Hao, Qiu Duyu

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引用次数: 0

摘要

介绍了一种将中频信号分两步移动到基带的二次数字下变频(DDC)结构。首先，利用基于多相滤波器的结构将中频信号移动到附近的基带，该结构在多相滤波器后放置混频器。然后，通过常规正交混频将信号移至基带。该结构可以减少滤波器资源，有效降低采样率和处理成本。特别推导了多相滤波器的实现结构，以及对输入信号的约束。最后给出了仿真结果，验证了新结构的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Filter analysis in the quadratic DDC structure

This paper introduces a quadratic Digital Down-Conversion (DDC) structure which moves Intermediate Frequency (IF) signal to baseband by two steps. Firstly, IF signal is moved to baseband nearby with the help of a structure based on polyphase filter, which places mixers after polyphase filters. Then, the signal is moved to baseband through conventional orthogonal frequency mixing. This presented architecture can reduce filter resources and effectively reduce the sample rate and process cost. The implementation structure of the polyphase filters is particularly derived, as well as the constrains on the input signal. Finally, simulation results are presented to illustrate the validity of the new structure.

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2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI)

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