DRM接收机射频前端芯片的频率规划设计  

Frequency planning of RF front-end for DRM receivers

作　　者：周建政[1,2] 王志功[1] 李莉[2] 王科平[1] 

机构地区：[1]东南大学射频与光电集成电路研究所,南京210096 [2]合肥工业大学计算机与信息学院,合肥230009

出　　处：《高技术通讯》2008年第5期480-486,共7页Chinese High Technology Letters

基　　金：863计划(863-SOC-Y-4-2)资助项目

摘　　要：基于 DRM 标准,研究并设计了一种 DRM 广播接收机射频前端芯片的结构,该射频前端选用了上边注入、固定中频的二次正交混频低中频结构。经理论推导,给出了该结构的4种镜像抑制比(IRR)与相位误差或幅度误差的定量关系。经综合考虑镜像干扰、互调干扰、低频本振谐波干扰、寄生低频噪声等因素与中频频率的定量或定性关系,确定了系统频率规划。该结构中除射频滤波器外其它模块均为片上实现,继承了低中频结构的所有优点。理论分析与仿真结果表明,采用该频率规划的接收机射频前端完全满足 DRM接收机射频前端的设计要求。此频率规划设计为射频前端芯片的电路级设计成功奠定了理论基础。A radio frequency （RF） front-end topology with high-side injection, fixed intermediate frequency （IF） and dualquadrature down-conversion was designed based on the Digital Radio Mondiale （DRM） standard. The quantitative relationship between the four image rejection ratios （IRRs） and the phase error or amplitude error in this topology was deduced theoretically. The frequency planning was accomplished based on the quantitative or qualitative consideration of the interferential effects of mirror image, intermodulation, low frequency local oscillator （LO） harmonics and parasitical lowfrequency noise on intermediate frequency （IF）. Except for the RF filter, other blocks of this architecture were integrated on a single chip, and this front-end possessed all the advantages of low-IF topology. Theoretic analysis and simulation resuits show that this RF front-end can meet the specifications of DRM receivers, and this frequency planning will be the theoretic foundation for the successful design of the circuitevel RF front-end.

关 键 词：DBM接收机 射频前端 频率规划 二次正交混频 低中频 

分 类 号：TN851[电子电信—信息与通信工程]