一种射频前端数字接收机中的低中频下混频器  

A Low IF Down-converter in RF Front-end Digital Receiver

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)

机构地区：[1]广州众诺电子技术有限公司,广东广州510630 [2]广州粒子微电子有限公司,广东广州510663

出　　处：《现代信息科技》2019年第13期37-40,共4页Modern Information Technology

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.

关 键 词：低中频 下混频 积分梳状滤波器 

分 类 号：TN722.3[电子电信—电路与系统] TN773