摘要
文章对比了射频前端接收机中传统的低中频数字下混频器结构,提出了另一种数字下混频结构,把传统结构中的抗混叠滤波器和抽取模块用积分梳状滤波器(CIC滤波器)替代,并把积分梳妆滤波器放到下混频器之前,把CIC滤波器的输出信号去和数字本振进行混频,使下混频器的工作频率降低,大大减少了下混频所需的乘法次数,并显著地减小了查找表的大小,有助于节省芯片的硬件资源。
This paper compares the traditional low-IF digital down-converter structure in RF front-end receivers,and proposes another digital down-converter structure. The anti-aliasing filter and decimation module in the traditional structure are replaced by an integral comb filter (CIC filter). The integrated dressing filter is placed before the down-converter,and the output signal of the CIC filter is mixed with the digital local oscillator. It reduces the frequency of the down-converter,greatly reduces the multiplication times required for down-converter,and significantly reduces the size of the lookup table,which helps to save the hardware resources of the chip.
作者
梁晓峰
叶晖
LIANG Xiaofeng;YE Hui(Guangzhou Zhono Electronic Technology Co.,Ltd.,Guangzhou 510630,China;Guangzhou Letswin Microelectronics Co.,Ltd.,Guangzhou 510663,China)
出处
《现代信息科技》
2019年第13期37-40,共4页
Modern Information Technology
关键词
低中频
下混频
积分梳状滤波器
low intermediate frequency
down-converter
integral comb filter
