The DDC module consists of Numerical Controlled Oscillator (NCO), frequency mixer, low pass decimating filter.
数字下变频的基本结构包括数控振荡器(NCO),混频器和低通抽取滤波器。
参考来源 - 数字中频技术在分布式天线系统的应用研究The design uses Xilinx Spartan XC3S400pq208,all the parameter should be considered along with the hardware. Digital Down Converter system includes two major parts:programmable down converter module,and high efficient decimation filter module.
设计主要包括两大部分:下变频模块和抽取滤波器模块。
参考来源 - 基于FPGA实现数字下变频的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
该器件配置片内抽取滤波器，可获得最高性能和灵活性。
The on-chip decimation filter is configured for maximum performance and flexibility.
其中包括混频器模块、抽取滤波器模块、信号产生器模块。
The system includes mixer module, the abstracting filter module and the signal producing module.
数字抽取滤波器是它的重要组成部分，通常采用多级结构来实现。
The digital decimation filter taking the important constituent in the Delta-Sigma Analog-to-Digital converter is realized by the multistage structure.
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